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Mikrogeophagus Altisinosus Aggressive?
February 14, 2012
10:53 am
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Michelle
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December 29, 2011
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I was gutted this morning when I find one of my M. Altispinosus floating. I did have six in a 300l community for gotta be two years now (all six still there on Sunday). At the time I brought them I kept a spare tank just in case I needed to move a couple out but they've been fine.

I dropped in a pinch of food so I could do a quick head count and instantly the dom. female lip locks with one of the others and the dom. male is having a right old strop at another. I only counted the four so looks like another has gone the same way, can't find her though must be in the undergrowth somewhere.

The dominant male and female have attempted spawning many, many times but in a community, as expected, nothing came of it. I watched one of the BNs interupt a spawn a couple of months ago, quite amusing to see the male M. Altispinosus take her on. Though the female was mightily upset.

All six were right as ninepence on Sunday, water params are clear I just checked, all the fish are happy and healthy. I can only put it down to spawning aggression, but why now?

Mayhap this will be my next project, move these two into the 60l and see what happens? If I can catch the critters ...

Adendum:

Hm, I've had my nose glued to the tank for an hour now and I think I might know why ...

Looks like the bottom two of the pack have paired up as well. The runty looking female who has never had any colour looks a little rosier than normal (wasn't sure she was a girly until now). All four of them are showing off. I made a few changes a few weeks ago, adding some plants and moving a bit of bogwood, looks like it upset the balance of the group. Oops, grumble, grumble. (Its the two middle runners who have bought it!)

Do you think I should move two of them or leave them to get on with it? Dont want any more fatalities.

February 14, 2012
4:06 pm
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Matt
Málaga, Spain
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What are the base dimensions of the tank?

Cake or death?
February 14, 2012
4:57 pm
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Michelle
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48"x18"xtall. I would have thought plenty of room for two pair (?) but the smaller pair seem to have decided on a spot about a third the way along the tank towards the back whereas the dom. pair have that same end front corner.

Over half the tank is 'free'. Maybe some more bogwood at the other end would encourage them along but having dwarfs in mind when I set the tank up the bogwood/rocks etc is fairly evenly spaced down the length of it. My two pairs of A. Thomasi managed in the same set-up but with fewer plants (thinking about it my one remaining A. Thomasi also inhabits that same end of the tank and that end is also the BNs favourite spawning place!) I wonder if that has something to do with the filter intake being at he other end? Can't think why they wouldn't like the other end its pretty even.

February 15, 2012
12:44 pm
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Matt
Málaga, Spain
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Should be plenty of room yes. Any chance you can post a photo of the set-up?

Cake or death?
February 15, 2012
1:44 pm
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Michelle
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Here's a pic. The guys all congregate on the left hand side the dom. couple to the front of the bogwood there's a nice stone there they like and the 'new pair' just to the right of that bogwood but at the back, again another nice stone. There's more bogwood caves and stones to the left of the heater on the right behind the pointed bit of bogwood.

Just getting through my BBA problem, it looks much better than it used to. The E. Parvifolia and E. Balansae in the middle are what's new. The piece of bogwood that was there in the middle is now also on the right near the filter.

The air tube thingy comes in from the right towards the middle.

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February 16, 2012
9:08 am
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Matt
Málaga, Spain
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Looks like plenty of space and hiding places are available. Did the dead fish have any external signs of injury Michelle?

Cake or death?
February 16, 2012
1:23 pm
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Michelle
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Still haven't found her despite a few pokes around. Done an extra water change though so if she's decomp hopefully wont be too much affect.

He looked like he was still lip locked with someone and lost, his whole lips protruding a lot. One eye was also marked quite a bit looked like he'd bashed it. Could have been post mortem but it looked as though it had had some kind of reaction swelling or whatever so I think it was prior to death. Otherwise in one peiece.

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