01-04-2011, 07:57 AM
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Originally Posted by LaneLester
I have 10 gal tank with ~15 guppy adults and a bunch of babies. Lately the fish have been mostly staying just under the surface, rather than swimming through the whole tank.
I thought this might be due to lack of oxygen. I have a very small filter that hangs on the side. It brings water in at its bottom and then spills the water out at the top. The top is about 1/4" above the surface of the tank's water, so there's a small waterfall effect.
I have a few live plants, but they are not growing much, unlike the situation in my 50 gal. tank. I suspect the light is not bright enough, and there's no outside illumination.
Do you have any thoughts about the fish congregating at the top?
Does sound as though oxygen depravation could be the problem. Perhaps adding a bit larger filter would help. I would also suggest performing a 30 to 50 percent water change with fresh dechlorinated water close to same temp as the water in the aquarium.
Would perform the water change asap until you can get a larger filter.
You could also add an airstone but the surface turbulence would not benefit your struggling plants.
Should you decide on larger filter,,I would run both on the tank for a couple weeks then remove the smaller one. Hope this helps.