That's useful to know, I feed live plankton ever few days, and iv been trying to find blue mushrooms but they are hard to find in england, I'm using a v2 hang on protein skimmer, not the best but seems to do the job ( wouldn't advise any one to buy a v2 protein skimmer due to it being so bloody noisy) Iv read alot of people have the same problem. I'm thinking about adding another power head ( circulation pump ) because I'm getting algae patches on my glass, my tank is well matured now so that's the only thing I can't think of that's causing these patches ( dead spots ), can I put to much flow into this size tank? I'm using 1x 900 l/h, 1x 3000 l/h