i just got a 10 gallon tank and had gotten a couple platys and tetras and a placo and within a week they had all died. i checked the ph and it was at least 7.8, my ph test kit only goes up to 7.8. i have a filter that is meant for 10 gallon tanks. now i have 4 catfish and an algae eater and they seem happy but the ph is still high and id like to be able to get a fish that isnt a bottom feeder but i dont want to kill any more fish. ive tried using a few ph reducers but the ph just goes back up after a few minutes. im not sure if theres anything else i should try or be looking at.