Do you dose Iodine? I had the same problem once, after I stopped dosing Iodine. (Someone at my LFS
told it was dangerous) I stopped for a while, and my polyps and Mushrooms stopped growing and nearly went extinct. I was freakin... I was reading an article after about 2 months later, that recommended the use of Iodine, and I restarted the dosing. Everything has come back to life. I did nothing with my lights, however as we all know, lighting is very important as well.