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Viewing 15 posts - 16 through 30 (of 301 total)
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  • in reply to: Tom’s Poco Pozo #354879


    @oaken said:
    Very cool. Great idea to grow Myriophyllum emersed actually. What is the emersed section made of? I.e. what are the emersed plants growing in?

    It’s as basic as you can get really – they’re just wedged barerooted into crevices in the wood. The Myriophyllum has some sand added to fill in the crevices and stop them floating off. Everything else is just wedged/floating.

    in reply to: Tom’s Poco Pozo #354876

    Oh yeah, I haven’t shown the emersed section yet – ferns, Pistia, Myriophyllum brasilliensis, Mayaca fluviatilis, Phyllanthus fluitans.


    in reply to: Tom’s Poco Pozo #354875


    @plaamoo said:
    Looking great as always Tom! Lots of activity. Seems to be more heavily stocked than usual for your tanks and still self sustaining. Impressive

    Cheers Plaamoo. Yup, pretty good number of fish in there, but it isn’t self sustaining like the old Bucket was originally. They get shovel-loads of food daily.


    @jk91 said:
    Amazing Tom, simply amazing. 
    What are your water parameters? DH, KH and pH and such? Microsiemens?

    Erm, not sure to be honest. I use a mix of rainwater and tap depending on the weather, but both are very soft… the rainwater is actually harder than my tapwater here (tap is less than 1KH)! Last time I checked pH was about 6 months ago and it was sitting at pH6.6, so not too extreme.

    @oaken said:
    Wow! I think it looks even better after the change.  Everything looks very natural, especially the fishes’ behaviour.

    I’m absolutely loving it at the moment – being able to see the fish is a bit of a novelty. My current faovurite is watching the breeding Apistos – female guarding the fry closely and the male defending a wider area whilst still trying to seduce other females when the brooding female isn’t watching. Amazingly the fry have made it to day 2 outside the cave, despite 100+ other fish in the tank. Some fry are just visible here if you look closely enough.


    in reply to: Tom’s Poco Pozo #354856


    Ack, sorry guys – seems I neglected this thread a bit! Real life got a frantic as I decided to finally finish my long-abandoned PhD, but things are a bit more chilled out now.

    Matt – yup, they’re just known as L. sp. ‘Rio Atabapo’ or crying whiptails.

    The tanks have been been equally neglected, with nothing but water topups and feeds for the last few months. I finally got around to sorting out the Pozo last week – I removed the palm grass which had completely taken over, become bigger than I am and was blocking 90% of the light from getting to anything else (it’s now doing the same to the pond).

    So, after a bit of a rearrange things look like this –



    The A. hoignei are doing well – they just spawned for the first time, fry have just become free swimming and the male is putting on a great show defending the surrounding area while trying not to attract the ire of the female.

    Courting –


    Male immediately ejected once the act was complete –


    On patrol –


    in reply to: Sex determination in Cyprinids (Sawbwa) #354404


    Hmm, not sure really mikev. I seemed to get a decent mix of sexes with 18-20 degrees C, pH 7.4, 170ppm.

    Actually in my original post I stated pH8.4, but I think that might be a typo… definitely raising the pH seems like the most obvious avenue to try.

    in reply to: Tom’s Poco Pozo #354375


    @barb Man said:
    Do you plan on selling anything? I know I would love to get some fish from you because I like the more South American feel like your tank shows

    I only tend to breed stuff in very low volumes to be honest, and generally they just go back in the community tanks once a suitable size. I’ve got about 20 2″ Guianacara juveniles for sale at the moment but that’s about it.

    in reply to: Tom’s Poco Pozo #354373

    Behold the miniature glory of N. anduzei – about 1cm TL and not far off fully grown! I suspect these will have to be my next breeding project.


    in reply to: Tom’s Poco Pozo #354371


    Well, some good and bad news on the fish front. Bad news is, all my Biotodoma died. They looked like they were doing OK, then the two skinniest ones suddenly went downhill very fast and I lost both within a couple of days. I decided that the supplier probably hadn’t wormed them properly and put the whole tank on a course of fenbendazole-soaked food for a few days. Promptly lost the other three. Everything else appears fine, but I’m not terribly happy about the whole thing and hope nothing gets passed to the other fish.

    As for good news, acquired four awesome little Rio Atabapo whiptails, and 18 miniscule Nannostomus anduzei.



    The anduzei have vanished into the plants, probably forever, but at least I know they’re in there and if they ever do show themselves I’ll try and get a photo!

    in reply to: Tom’s Poco Pozo #354266


    Hi Byron,

    Thanks for your concern, and I totally understand your viewpoint. However I have done my research, and am dosing at a level that is significantly below described No Observed Effect Concentrations for algae, fish and invertebrates. I also dose this (at a slightly higher concentration) in some of the display tanks in the LFS in which I work and have observed no noticeable effect on the health of fish and breeding of invertebrates therein. Furthermore it is rapidly biodegraded in an aquarium, so even these concentrations are a maximum which should drop rapidly. It also hasn’t prevented my fish from breeding; just yesterday I spotted another N. eques fry only a few mm long.

    I do of course monitor my fish closely (I’m sat right next to the tank for much of the time) and if I perceived any issues I’d be sure to halt dosing.

    Cheers, T 

    in reply to: Tom’s Poco Pozo #354264


    And how it looks in the evening with just the spotlights on. Added some Ludwigia arcuata and ‘giant hairgrass’ –


    in reply to: Tom’s Poco Pozo #354263


    Some fish –







    in reply to: Tom’s Poco Pozo #354230


    As you say Bill it is pretty reactive – I don’t think anyone has established the precise reaction pathways either outwith or within the plant, although there seems to be some assumption that it is absorbed directly by the plant. Also it is generally quoted as being largely degraded within about 12 hours of adding to the aquarium, but I have no idea what data that comes from.

    in reply to: Tom’s Poco Pozo #354222


    @BillT said:

    I have also just started dosing home-made liquid carbon (gluteraldehyde solution) as a bit of an experiment as I;ve never used it before and it’s very cheap.

    Whats the logic behind using gluteraldehyde?
    I would assume there are a lot of alternative chemicals that could be used as a carbon source (like alcohol).
    My familiarity with gluteraldehyde comes from doing histology where it is a very strong fixative (cross linking protein and other chemicals via amino groups). Its kind of toxic. As is formaldehyde which is used to treat some external pathogens.


    Gluteraldehyde (or various isomers of) is the primary active ingredient in commercial ‘liquid carbon’ supplements such as Excel and Easycarbo. It is absorbed by the plants and broken down to access the carbon – not as effective as co2 injection but can give significantly faster growth rates than typical low tech tanks. It has the happy side effect of also being an algaecide, although I don’t have an issue with algae.

    It is pretty toxic stuff, but typical aquarium dosing concentrations are around 1-2mg/l.

    I’m erring on the side of caution and dosing it at approx 0.3mg/l, which is below the No Observed Effect Concentration for inverts – http://www.inchem.org/documents/sids/sids/111308.pdf

    I don’t know enough chemistry to suggest why it is the compound of choice for liquid carbon.

    in reply to: Tom’s Poco Pozo #354219


    Two more shots of the nicest A. hognei pair (in a separate breeding tank for now) –



    in reply to: Tom’s Poco Pozo #354218


    @barb Man said:
    Yes literally my dream tank aside from the neons I don’t really care for tetra but they are native along with some of the other fish so I know why you would add them as well as they are very bright. I love the mini earth eaters. I only have rams now but I would love to move up to full Geophagus in the future. All in one? Is it rated on the NPK scale at like 10-10-10? I need something for my thirty gallon because mine is all sand also and I can barely get anubias and java ferns to grow. I have a lucky bamboo and a foot of elodea in there but if they show any signs of dying I’m going to pull them out. The thirty is housing a mix of random fish. The odd visitor is a two inch peacock bass that I’m holding for my monster buddy. I have lots of white cload and he wanted to know if they would grow faster if they were fed live completely. I would love to see you get like twenty or more otocinclus when the farowella leave us but that might not be for a while.


    There are already 12 otocinclus in there. They are fat and lazy and hence I don’t see much of them. I may get another dozen at some point.

    This is the fert I use, 5ml per day – http://www.ebay.co.uk/itm/LUSH-Max-Aquatic-Fertiliser-1-litre-Aquarium-Plant-Food-Fish-Tank-Fertilizer-/291377257438?pt=LH_DefaultDomain_3&hash=item43d7701bde

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