u/filipwil

I posted a few days ago about losing about a fish a day for the past week. The problem continued, despite my best efforts. My kids are crushed-I’m hoping someone here can guide me (I’m new to this) on what to try next.

Tank is a 75g freshwater, properly cycled (fishless). Water parameters continue to look good and stable. Have a Fluval 407 and I increased surface agitation because I was worried about oxygen (the angelfish like to stay at the top, but nothing else does). Tank temp is a stable 77.5 degrees.

Tank was stocked with angelfish, Cory and upside down catfish, neon tetras, Congo tetras, emperor tetras, and ram cichlids.

Losses have been across species, except the neon tetras and ram cichlids remain healthy. I lost my first angelfish this morning (my kids’ favorite fish!).

I had suspected aggression previously, but I think that’s less likely given losses across species. Now I’m wondering if there is some undiagnosed issue with the water, or some disease?

Does anyone see anything alarming in the attached video that can give me some direction?

Thanks,
Bill

New here. Started a 75 gallon tank, properly cycled and water parameters have been stable since.
Stocked with the following (in 2 rounds), as suggested by a LFS (kids were dead set on angelfish):

4 small angelfish, 3 Cory catfish, 2 upside down catfish, 3 Congo tetras, 6 neon tetras, 4 ram cichlid, and 3 emperor tetras

Everything was fine for about two weeks and we lost a Cory catfish. Chalked it up to him being sick or something.

A week later, we lost two of the emperors. One of them was stuck in the filter intake (didn’t think it could happen with my intake, but put a new sponge on it right away), and the other was on the bottom half eaten.

Now one of the Congo tetras has what appears to be blood up near his fin and maybe some signs of being bitten (not 100% sure about that).

What could be happening? As mentioned, water parameters remain good. Are my fish attacking each other? Something else? Im just at loss and don’t know how to stop fish from dying - it feels like I’ve lost control and it’s not a good feeling (and my kids are very worried!!).

Continue to lose fish-video this time!

Losing fish but don’t know why?