Might be kinda long post...not sure where to put it yet. Here goes... I bought my husband a 55 gallon tank for Christmas. We set it up with the under cabinet filter system (nice!), and let it run for about a week before introducing fish. We got 6 guppies, 2 balloon bellies, 1 swordtail, 4 black skirt tetras, 4 glo-lite tetras, 2 plecos, 2 albino cories, and three painted glass fish (I didn't know THEN that they were INJECTED!! Poor babies!). Anyway, we lost the occassional fish here and there, we've had approximately 80 guppy fry altogether (not all lived), and we currently have about 20 babies in the other tank (my nursery). Recently, I moved five juvies to the "adult" tank, they seemed to be okay, not being bullied or anything. We were having a little problem with a green haze in the water, changed the filter, etc., and Friday I put in the recommended dose of an algae remover. This morning, (Sunday), I found five dead guppies, my female balloon belly, and a glass fish. What could have happened to them? They were all fine yesterday. Any ideas?