What does this mean?
so what should I do? I have had the octopus running since Monday.. so 7 days on Sunday.. it was almost full at the top.
Well I just read through a few of your threads you've posted. I took from it that you're fair new to saltwater. You have a small 30 with a handful of fish. You've bought fish that shouldn't be in a tank of your size (i.e. H. Tusk, purple tang, maybe couple others). Many if not all had diseases (ich and velvet if I'm not mistaken). All of which are worry some.
My suggestion is to slow down a bit. Do some more reading and asking questions. Hold back from purchasing fish or coral. Get good test kits and a good RO/DI kit. Established a routine that you can consistently do on a week to week basis without changing it much. Understand water quality as far as parameters and make sure those parameters are consistent. This is just the beginning to a beautiful reef tank.