What problems are you actually having? 8 ppb phosphorus (.0245 ppm phosphate) and .2 nitrate is no problem - mine are lower than that and stuff thrives. This might not be a building block issue... it sounds like you have heavy import and heavy export, which is what you want moreso than residual numbers on a test kit. With that amount of food, I doubt that anything in your tank is growth limited by either of these building blocks.
FWIW - you have to take your ppb reading from the Hannah ultra low times 3.066 and then divide by 1000 to get ppm of phosphate.
If you have an acute list of problems, then post them up and we can help.
FWIW - you have to take your ppb reading from the Hannah ultra low times 3.066 and then divide by 1000 to get ppm of phosphate.
If you have an acute list of problems, then post them up and we can help.