Is my tank overstocked?

[Stefan]

I've got a 30 gallon tank with 10 Neon Tetras, 5 Corydoras, and a pair of Angelfish. Running a Fluval 307 canister filter, weekly 25% water changes, and parameters are stable at 0 ammonia, 0 nitrite, 10 nitrate. The Angelfish seem a bit territorial lately. Am I pushing it?

[oakleaf]

Dude, Angelfish can be such divas, especially in smaller tanks. They're probably just flexing their fins. How's the aggression? Any nipped fins or hiding fish? Also, what's your decor like? More plants might chill them out.

[zenox7]

Your bioload is manageable with the current filtration and maintenance, but Angelfish need more horizontal space as they grow. A 30 gallon is borderline for a pair long-term. Are they juveniles? If they're over 3 inches, consider upgrading or rehoming one.

[Stefan]

Dude, Angelfish can be such divas, especially in smaller tanks. They're probably just flexing their fins. How's the aggression? Any nipped fins or hiding fish? Also, what's your decor like? More plants might chill them out.

No nipped fins yet, but the Tetras dart away when the Angels swim near. I've got driftwood and Java Fern, but maybe I'll add more cover. Thanks for the tip.

[oakleaf]

Yeah, Tetras are basically snack-sized to Angelfish, lol. Floating plants like Frogbit could help break sightlines. Also, try feeding in opposite corners to distract the Angels. Worked for my sketchy pair.

[zenox7]

I've got a 30 gallon tank with 10 Neon Tetras, 5 Corydoras, and a pair of Angelfish. Running a Fluval 307 canister filter, weekly 25% water changes, and parameters are stable at 0 ammonia, 0 nitrite, 10 nitrate. The Angelfish seem a bit territorial lately. Am I pushing it?

Your stocking isn't excessive, but the Angels' behavior suggests stress. Monitor their growth and aggression closely. If they start breeding, the tank will feel much smaller. A 40+ gallon would be ideal.

[oakleaf]

Breeding Angels in a 30? That's a soap opera waiting to happen. My buddy's pair wrecked his tank layout when they spawned. Sand substrate everywhere, plants uprooted… chaos.

[zenox7]

Agreed. Breeding behavior escalates territoriality. If you're attached to the pair, prioritize upgrading. Otherwise, rehoming one Angel might balance the tank. The Tetras and Corys are fine as-is.

[Stefan]

Got it. I'll start scouting for a bigger tank or a new home for one Angel. Appreciate the advice, everyone.