I have a 100-gallon tank that has been established for about a year which has two Biopro External Canister Filter 1800 UV
and it gets a water change of about 10% done either once a week or every two weeks.
The parameter of the tank ammonia, nitrites, nitrates are all 0, temp is about 25 to 26 and the pH sits at about 7.2 i recon and I also add a bit of tap water conditioner when I do a water change.
For substrate, I have a soil gravel mix and the tank is full of live plants and some driftwood. For feeding, I usually alternate between flakes and pellets and some wafer pellets. Also, on Friday I donít feed them than Saturday I give them some frozen fish food blocks.
This is the list of what I have in my tank:
- 3 rosy find tetras
- 5 black widows
- 1 pleco
- 8 cory catfish
- 3 jeweled cichlids (1 breeding pair)
- 1 spotted gourami
- 1 moonlight gourami
My issue is been trying to add some more cichlids to the tank and they keep dying about 3 to 4 weeks after I have added them. Iíve tried a yellow cichlid and an electric blue cichlid then 2 demasoni and most recently another yellow cichlid. They act and look fine they didnít have any tears in their fins and they didnít look bloated. During two of the time I had also bought the cory fish and they are still all fine.
I thought it could be an internal parasite or a disease but none of my other fish are dying only the new ones and usually after 3 to 4 weeks. The water should be fine since it is such a large tank it less likely there was an ammonia spike. Also, my breading pair of jeweled cichlid have laid eggs twice now in between all this, granted they have only gotten as far as laying the eggs. I donít think they are very good parent because they keep laying them under the filter intake head and the eggs I think are getting eaten by the other fish.
Does anyone have any ideas because I am out of ideas?