Fish Dying Help

[sharky333]

I have a 125 ltr tank its a fluval roma but the filter is from my old jewel tank of the same size. recently had a big leak in my other 125ltr tank and had a big drama moving the fish into a tempory vat with the filter and heater and aqua stone still running inside. after buying the new fluval tank i put all the sand plants bog wood water and filter back into the tank. the new tank has been running for 20 days (with mature filter and cycled water)i have done regular once a week water change of ten percent because the water tests have come back clear. over the past 3 days i have lost 2 female mollys, 1 black lyretail molly and one dwarf gourami. there was a small problem with whitespot but that has been treated and was cured a few days before fish started to die. my female balloon molly is looking sick.

all the fish and the sick molly acted lethargic hiding getting stuck under wood drifting and floating around the tank there is no obvious reason for death no sores no unusual body shape. (one of the mollys had very pale gills so wasnt getting the oxygen she needed) i really dont know what is going on. there are two baby mollys about six month old that are both happy and healthy free in the tank. helllppp !!!

water tests today came back as
oppm ammonia
oppm nitrate
ph 7.6 lower than usual
2.00ppm nitrate

I have a 125 ltr tank its a fluval roma but the filter is from my old jewel tank of the same size. recently had a big leak in my other 125ltr tank and had a big drama moving the fish into a tempory vat with the filter and heater and aqua stone still running inside. after buying the new fluval tank i put all the sand plants bog wood water and filter back into the tank. the new tank has been running for 20 days (with mature filter and cycled water)i have done regular once a week water change of ten percent because the water tests have come back clear. over the past 3 days i have lost 2 female mollys, 1 black lyretail molly and one dwarf gourami. there was a small problem with whitespot but that has been treated and was cured a few days before fish started to die. my female balloon molly is looking sick.

all the fish and the sick molly acted lethargic hiding getting stuck under wood drifting and floating around the tank there is no obvious reason for death no sores no unusual body shape. (one of the mollys had very pale gills so wasnt getting the oxygen she needed) i really dont know what is going on. there are two baby mollys about six month old that are both happy and healthy free in the tank. helllppp !!!

water tests today came back as
oppm ammonia
oppm nitrate
ph 7.6 lower than usual
2.00ppm nitrate

also the tank is heavily planted.

 

[Fish Lover Forever]

Well it could just be natural causes. Maybe it is time to say good-bye!?

 

[snazy]

there was a small problem with whitespot but that has been treated and was cured a few days before fish started to die. my female balloon molly is looking sick.

Not sure what you mean treated a few days before the new fish died? How long did you treat for? Whitespot doesn't disapear in the course of a few days. When you stop seeing the white spots on the fish, the parasite has fallen off and this is the only time it responds to medication. If you didn't do the treatment at least a week after you saw the last white spot then you can still be dealing with white spot. Keep in mind that when fish get infected by ich, it could be anything from a few days to 2-3 weeks before you even see a white spot, so the lack of them is not indication they are suffering from something else. But they could have developed additional bacterial infection as a result too.

On a side note 10% water change a week is quite low. Low nitrAte is not an indication that you shouldn't do a water change, or you should do a small water change. There is a hole lot more stuff that builds up in the water and should be removed. Do you have a TDS(total dissolved solids) meter? This would give you a better indication of the quality of the water.