My parrots are dying one by one

[Fishofmind]

Hello, Good day everydayone
I got a 6x2x2 ft tank and it's been running for 2yrs, the water parameters are; ammonia: 0, nitrite 0 , nitrate: 30ppm, water ph is 7.2 and the water temperature is 26°c. This tank has a 80 gal sump with mechanical, chemical and biological filter medias. I do 20% water change every week. I use this tank as a growout tank for my Angelfish fry.
So here's the thing, I add some juvenile toffee parrot fish two weeks ago but after 3 days, those juvenile parrot fish are dying one by one until now. The tank has 30pcs Angelfish(small, half inch in size ) with them and I don't have an issue with those Angelfish only the parrot fish are dying. Their diet is bloodworms, I feed them once or twice a day sometimes I skip a day before feeding them and I never overfeed those guys.
What do you think is the cause of their death?
Can someone help me?
if someone experience the same situation, do you mind to share your experience to me?
Thank you so much

 

[FINWIN]

Hello, Good day everydayone
I got a 6x2x2 ft tank and it's been running for 2yrs, the water parameters are; ammonia: 0, nitrite 0 , nitrate: 30ppm, water ph is 7.2 and the water temperature is 26°c. This tank has a 80 gal sump with mechanical, chemical and biological filter medias. I do 20% water change every week. I use this tank as a growout tank for my Angelfish fry.
So here's the thing, I add some juvenile toffee parrot fish two weeks ago but after 3 days, those juvenile parrot fish are dying one by one until now. The tank has 30pcs Angelfish(small, half inch in size ) with them and I don't have an issue with those Angelfish only the parrot fish are dying. Their diet is bloodworms, I feed them once or twice a day sometimes I skip a day before feeding them and I never overfeed those guys.
What do you think is the cause of their death?
Can someone help me?
if someone experience the same situation, do you mind to share your experience to me?
Thank you so much

Hello

I was looking over your problem. PH at 7.2 is too low for parrots. Nitrates at 30ppm is too high and indicates you are already maxed bioload wise. Sounds like PH shock is killing them...and the nitrates. You have 30 some fish that is extreme bioload and when those fish grow there's no way that will work. Your water change schedule needs major upgrade to get those nitrates down. Parrots also get territorial as they age. All those cichlids won't have enough space.

The other fish appear to have adapted to the nitrate soup but it isn't good for them long term either. Sickness and stunting will be likely. Parrots are hybrids from higher ph fish.

Start with more partial water changes, say 30 percent twice a week. Parrots do best at Ph above 7.6. You will ultimately have to thin the herd or get another large tank. Good luck!

 

[ad88]

What you have listed doesn’t scream out anything that would cause your fish to be dying off. I might suggest a slower acclimation to your tank taking longer slowly adding water to a bucket with the new fish in it. You should increase your water changes and possibly your current fish are used to the makeup of your tank. There could also be some pathogen in your tank that Your current fish have also adapted to and the new fish are dying from it.

 

[Caveden]

Hello

I was looking over your problem. PH at 7.2 is too low for parrots. Nitrates at 30ppm is too high and indicates you are already maxed bioload wise. Sounds like PH shock is killing them...and the nitrates. You have 30 some fish that is extreme bioload and when those fish grow there's no way that will work. Your water change schedule needs major upgrade to get those nitrates down. Parrots also get territorial as they age. All those cichlids won't have enough space.

The other fish appear to have adapted to the nitrate soup but it isn't good for them long term either. Sickness and stunting will be likely. Parrots are hybrids from higher ph fish.

Start with more partial water changes, say 30 percent twice a week. Parrots do best at Ph above 7.6. You will ultimately have to thin the herd or get another large tank. Good luck!

Don’t think it’s extreme bio load.. the angelfish are half an inch atm, it’s basically 30 neon tetras in a 6ft tank.
The nitrates is the problem

 

[FINWIN]

Don’t think it’s extreme bio load.. the angelfish are half an inch atm, it’s basically 30 neon tetras in a 6ft tank.
The nitrates is the problem

That ph for parrots is dicey...something is causing those nitrates to jump. High protein foods will make nitrates higher through waste. I'm suspicious of the bloodworms, especially if fresh. They've been known to have pathogens depending on the source.