Hi, I have a tank with 2 ADF and 3 albino cory catfish. The ammonia level is at 0.50ppm the nitrates are at 5.0ppm, the nitrite is at 0ppm, ph is at 7.2 and high range ph is at 7.4. I've been doing a partial water change about every 2 or 3 days the last week and usually use some seachem prime but it hasn't been lowering it much. I don't want to loose my fish or frogs.. I recent had to move them from old tank to new tank due to a Crack in the tank. So I'm just not sure what I can do you lower the ammonia before it kills my critters any help would be much appreciated thanks.