Help! Fish Going To Die...

[Jayladd]

Do dying plants give off any other chemicals that could possibly kill fish though? Like another chemical other than ammonia or nitrates, which my tests can't pick up?

 

[a.wagg]

What kind of plant?

 

[Jayladd]

No idea i'm afraid. All i know was that it had very thin, small leaves. I have removed it now before the water change i did.

After doing about a 60% water change the fish are still acting very strange. I'm just clueless to whats going on. My pleco seems fine, i think its just weak guppies!