advice anyone???

[fiorano]

I've had a reef tank for probably about 6 months now but evertime it just finishes cycling and the water gets ready for fish something dumb always happens. First i added all my rock and had some fish and corals and stuff then i guess i didnt do ebough water changes and my water was so bad i had to put my fish in my friends tank and practically start over again. then right after i got my tank running good again the seam split and i had 135 gallons of saltwater all over my carpet. I managed to save most of the life in my tank and i got a new one and set it back up and im doing water changes and everything but for some reason and my substrate is starting to turn a brownish yellow color kind of like djion mustard and som,e of the rock is doing the same. and also some of the rock is getting dark red patches on it as well as parts of the glass. and i dont think its just an algae bloom because my friend said it might be some kind of bacteria or something and i was wondering how i can get rid of these 2 issues? would just getting more cleaners and such help and if so what kind? i will be very grateful for any advice