Well, as a blanket statement; "Toadstools unlike many softies require intense lighting." I disagree. My toadstool always did best under moderate light i.e. stock compacts on biocube and regular T5 not HO. Under more intense light mine suffered and before I put the pieces of the puzzle together it was too late. Also, I found Alk to be somewhat of a factor. Below 10 also affected it. Mine like 11-12 ppm.Toadstools unlike many softies require intense lighting. You may try moving it higher up in the tank closer to the water surface and see if that helps. Also they like moderate flow so make sure its not in a "stagnant" area of the water collumn. One good thing is these guys are seemingly bulletproof and will come back to its former beauty once it gets the parameters it needs.