Ah, well, I think I see what might have happened, and I don't think you're out of the woods yet, either. You let a tank go for 3 weeks with only 4 small fish in it. Your Biofilter adjusted for that small bioload. Then you added:1 Male Beta
1 Green cory cat
1 Clown loach
1 Powdered blue gourami
2 Emperor tetras
2 Ballon mollies
1 Pleco
1 Raphael cat
1 Peacock eal
2 Rosy barbs
6 Neon tetras
3 Small red fish look like the neon tetras but are red and have a black stripe on the side , sorry but dont know their name.
So, basically, your tank is cycling as we speak in all likelihood. I would suggest 50% water changes every day and continued daily testing of your water. Neon tetras are infamous for being some of the best indicator fish around for declining water quality. Unfortunately, they die as the indicator. I have a feeling they were just the beginning unless you can get ammonia and nitrite under control.
1 Green cory cat
1 Clown loach
1 Powdered blue gourami
2 Emperor tetras
2 Ballon mollies
1 Pleco
1 Raphael cat
1 Peacock eal
2 Rosy barbs
6 Neon tetras
3 Small red fish look like the neon tetras but are red and have a black stripe on the side , sorry but dont know their name.
So, basically, your tank is cycling as we speak in all likelihood. I would suggest 50% water changes every day and continued daily testing of your water. Neon tetras are infamous for being some of the best indicator fish around for declining water quality. Unfortunately, they die as the indicator. I have a feeling they were just the beginning unless you can get ammonia and nitrite under control.