ok, I have a 75 gal saltwater tank. loving the hobby I have been looking at more tanks. Well low and behold I acquired 4 more tanks. a 55, 45 hex, and 2 30's. I am wanting to set them all up. I was thinking of doing 1 big sump to run them all. Is that a good idea or should they all run on there own? If 1 big sump will work what size should it be? I was thinking of using 1 of the 30's for a sump is that big enough? I may scratch setting up the 45 gal hex do to space and the fact that I have to replace a pain of glass in it. I thought that it may be less expensive if I use 1 sump also.