January 9, 2013
July 17, 2011
It'll depend a bit on how much cover you've got for the critters and what the fish are. If your substrate isn't too fine or there are lots of nooks and crannies that the fish can't get in to, then you could try California blackworms (Lumbriculus spp.), Hyallela azteca or Asellus aquaticus. Shrimp (e.g. Neocaridina heteropoda) are also a favourite fish snack, but potentially expensive!
January 27, 2014
you might want to try chironomids, the well known bloodworm. they multiply easily if fish population (appetite) is low; they need organic substrate - forest litter in my case - and I suppose some free air space above the water, too.
see below some pics of adults, egg packs, hatching eggs, and empty shell (these are eaten, too).
at low light they start swarming, it`s nice to see fish jumping to catch them (harlequin barbs in my case).
the forest litter may bring some problems, but teems with life. Never have to feed fish. see also tubifex and other critters that have established themselves without specific actions.
June 13, 2011
January 27, 2014
Hi Matt, really don't know how they got in. Same with tubifex. I never entered live feed. Perhaps eggs came with plants. or the adults chiro's managed to get into the tank which would be easy, they get out, too! Fortunately they do not sting. They seem to be small relative to the ones I see swarming outdoors here on evenings with fair weather, about half that size or less. Not sure if this a local species from here (Belgium), there seem to be an overwhelming number of species in this family, have no faint clues how to tell them apart. Any advice welcome, I can send better pictures showing antennae if anyone feels like digging into this identification.
the litter is from upland forest, I would not expect aquatic life they, but not sure.
other small creatures are tiny jumpers on the water surface, very fast even for the harlequins. They crawl on the glass screen, floating leaves etc. There is a lot of gold algae on the water, perhaps they feed on that.
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