Hi all, I'm curious, I've been throwing in large amounts of ferts into my tank. Currently, I put in (not 100% sure of the formula stuff as not got the paper with me!) Macro (3 x week) 16g MgSO4 12g KNO3 4g KH2PO4 Micro (2x week) 1g Trace 3g KSO4 I've been comparing that to others on this forum and it seems a bit heavy, considering I mainly have low dose plants (like crpyts and anubias) for my 2x 39W lights. I would like to know how much of the ferts is left at the end of each week cos I don't want to be wasting the ferts. I don't want to leave no ferts in there, but would like to make sure I'm not wasting my money! But then I don't want to reduce my dosing and then algae starts again (argh!). Is there any test kits? I guess I'd be able to use the a standard Nitrate kit for the Nitrate? I know they're not 100% accurate but would give me a decent indication right?