I recently submitted a post on my water quality in my fry tank but didn't get much of a response so here goes i can't get my waters nitrite down to 0ppm in my fry tank its either 0.25ppm or not quite 0ppm what i would like to know is will these levels harm the fry as uptill now they seem to be doing ok and are growing and colouring quite rapidly. Cheers, Derek.