hi, i have 4 red noes rummys, 4 cardinals, 2 platys and 3 harliquins , all doing nicely though nitrite keeps going to 1 or 2 regular, ( though it never seems to change to nitrates as always a low reading on this )I'm on holiday for 12 days and my daughter will be popping in every other day so thought the nitro zorb would do just in case it spiked while I'm away.. thanks