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