Added to many fish to soon, you only add a few hardy fish till the tank has cycled.
They have to go through the ammonia and nitrite process its like living in a toiilet.
It can take its toll on a fish causing the immune system to shut down.
http
/www.thetropicaltank.co.uk/cycling.htm
http
/www.thetropicaltank.co.uk/cycling2.htm
Boy do I feel like a fish moron! What does "cycled" entail? The tank was running for more than 24 hours before we put 1 fish in. Then a week later we added 3 more. The Molly is now separated because I believe she's pregnant. The other three are cruising around happy as can be. I swear I'm not listening to anymore PetsMart employees. Everytime I ask a question I get a different employee and the info is always contradicting. I've done everything they told me and bought everything they told me and this is the first I'm hearing about a water test kit! WARNING: STAY AWAY FROM PETSMART!!! They get paid $6 an hour for a reason!
You learn quickly grasshopper! Petsmart is kinda like walmart or an auto parts store. Only go there if you know exactly what you need, they're basically useless for advice. God bless em for trying though! (not really, disinformation kills alot of fish..)
Just read that article on cycling REALLY well, it'll tell you everything you need to know!