Lately my 12g Nano has had an outbreak of red cyano and some kind of yukky stuff that looks like pond scum-??? floating on the surface and sticking to the corals. I had recently added a small coral frag (green zoa polyp) and a small reddish-orange starfish (with black dots). My yellow coral and pulsing Xenia in particular are doing badly. The Xenia might just be going through a cycle- I've had this happen with PX before. It's stalks are elongated and it's pulsing tips are shrinking/shriveling. I have treated with iodine, SPARINGLY, although I've read that I really shouldn't have to do this-? True or not? It's funny, I've kept yellow leathers before, and I remember the little polyps that come out, (you know, the little hairs that make it fuzzy looking) but this one has never had those. I've been doing water changes 25-50% weekly. Salinity is around 1.07, and I have to do a Ph/Ni/Na etc. water test tonight after work. I did something that you guys will probably yell at me for: I used a soft toothbrush (lightly) to get some of the cyano off the leather. I probably killed it, because now it's doing worse than before. It looks shriveled and sad. Any suggestions? As far as the red cyano, I read that scarlet leg hermits are the only ones known to nibble on it. I'm hesitant to get these, because I was trying to keep my reef hermit-free (since the reef will be transferred to a seahorse tank, and no crab is really seahorse-safe). Is there anything else I can do for these problems except monitoring water perameters and water changes (and maybe NOT brushing my leather)?