hi all , just been reading some of the posts and they are very helpful. i am running a 75 g salt tank w/just a fluval 404 can filter. approx 75 lbs live rock and hang on skimmer.piece of junk. i'm working on setting up 125 g tank i purch used. after reading here it looks like i will build a sump to acomodate a good skimmer. i know there are probably tons of postings for diff skimmers and which ones are best. but if anyone has suggestions i would appreciate it so i can try and not make as few mistakes as possible. also what to put in sump for filtration ? would be great. i also got a red sea ocean clear can filter w/tank. my fishes are greatful ! and can not wait for their new home. :D