Hi my latest water test results
Nitrate 0
Nitrite 20
Ammonia. 0.25
High PH 8.0
PH 7.6

I use seachem prime on water changes,should I do 15% water changes once a week to get the ammonia down to zero or more four fish are still flashing ?,I have 5 pearl danios 4 zebra danios and Four Venezuelan black corydoras in a 85 gallen tank,I was giving the four zebra danios as my friend was going to get rid off them so I know I'm a little over stocked,some advice would be appreciated thanks
Peter

You should be always doing at least 25% a week as regular maintenance. If you have ammonia in the water you need to do more, any time it is present. You have said nitrite is 20; do you mean nitrate? If it's nitrate that's OK but if you really have nitrite at that level you need to be changing almost all of the water to get it down to close to 0.

Sorry nitrite and nitrate are both at 0 I'll do a 25% water change on monday Wednesday & friday and test again next sunday nitrate was 20 a week go now 0 thanks for your advice it's really appreciated
Peter

Hi fish seemed to have stopped flashing after doing a 20% water change every other day for two weeks doing another water test Sunday, should I do two 20% water changes a week on monday and fridays as I'm slightly over stocked to keep the ammonia at zero ?

Thanks again
Peter

Once your cycle is fully established you shouldn't see any ammonia. While it's present keep doing water changes to keep it low. Once it's staying at 0 you can move to a once-a-week 25% change for regular maintenance.

Ok thanks for your advice the tank has been established for five years but the fidh started flashing out the blue last water change was Friday I'll do a water test tomorrow then a water change monday then Friday then hopefully once a week

Thanks again

Peter

I'm a bit baffled I've been doing 15% water changes every other day for two weeks using seachem prime and filter start I've just done a water test and the ammonia is still 0.25

Every thing else has stayed the same for the 4 weeks I've been testing

Nitrate 20
Nitrate 0
High Range PH 8.0
PH 7.6
A couple of the fish have started rubbing against the gravel
I have 5 Pearl danios 4 zebra danios 4 Black Venezuelan corydoras and breeding assisian snails in a 18 and a half gallon tank ,I took the zebra danios from a friend who didn't want them anymore,what's your advice please to get the ammonia to 0.
Very frustrated
Peter

Which test kit are you using?

The API master test kit

Test your tap water. If that comes back the same then it's the test, not the water. The API ammonia test can look a bit like0.25 when it's actually 0.