What's going on?

[Psyberfox]

I have a 20 gallon tank, I feed my fish at least once a day. Buying Guppies probally wasn't the best Idea...I bought 7 at once and added them straight into the tank. (Which I now know you never do). Anyways it's been and the one's that survived the first mistake are now starting to die. (About one every five days. I noticed that the one that died today looked like it had been eaten by another fish. His stomach was almost gone. After looking at some of the other guppies, I noticed there tails have been chewed on. (Or at least looks that way).

I never seen any of the fish act aggressive towards one another...

2 Back skirt tetras
2 White skirt tetras
3 red eye tetras
3 Orange/ Black Tetras
3 Guppies left

Any ideas of what's going on?

 

[homebunnyj]

My money's on the bs & ws tetras. Nippy lil buggers... at least in my tank. IDK about the other types of tetras.
How are your water parameters? (ammonia, nitrite, nitrate)?

 

[Psyberfox]

I don't know the exact levels but I have been adding cycle and Aqua Plus once a week.

 

[GIS Guy]

Fish can get aggressive w/ lights off.
They may be picked on during the night.
'least what I've been told.

 

[YahooFishKeeper]

cycle is a waste of money. does nothing. good ol' water changes are best. i suggest doung a 50% WC today and tomorrow, and checking levels.

 

[Mom2Angel]

yep, my BS and WS are really nippy...so bad the have gone into a tank by themselves. I had guppies that all died as well...I gave up on them.

 

[MissFishy]

I never have any luck with guppies and other fish together. I seriously think you need to put guppies in by themselves...they aren't very fast or aggressive and the other fish tend to nip at their pretty tails...