Gents Could anybody please advise on water parameters for an 217L tropical aquarium Aqua one AR980 tank. Current parameters are pH = 6.4 KH = 3 GH = 3 Nitrates = 0 Nitrites = 0 PO4 = 35 approx. CO2 indicator colouration - Lime green 1.5 bubbles per second. The reason why I am asking is because I have been advise to increase my nitrates which in turn will reduce my PO4which will assist in reducing the slight algea issue I have. I add Nitro everyweek - instruction say 10ml per 500 ml will increase the NO3 by 2.0ppm and K by 1.3ppm - I add 5ml half the doses is this right or should I be adding more. Regards Paul.