Hi! Iâ€™m having some trouble with my crypts. Leafs start growing well but once they reach a good length the colour turns darker green and in a few weeks almost brown. I was suspicious about the CO2 but it seems fine (lime green drop checker). Upped my PO4 to around 9ppm but still no results. The edges of the leafs sometimes a bit â€œwaveyâ€. Iâ€™m adding KNO3 30.7 ppm PO4 9.3 ppm SO4 30.2 ppm MGSO4 13.2 ppm 5ml Excel/day And double of the recommended dose of micros. I just realized now Iâ€™m adding extra SO4 with the magnesium!!! Is it too much? I have the same problem with Eleocharis parvula, they turn dark after a few days. There is a nice big bunch of Hygrophila difformis in the tank, is it possible it eats up all the nutrients? My last guess is the lighting. I have a rio 180 with T5â€™s but no reflectors. Glued cling film on the top of the hood from inside, not so sure if it does the job! Or maybe I received wendtii brown instead if green? All ideas welcome!!