I had a leak, crash and plenty of drama, but it looks like I will set up again. I bought a 70 gallon system for soft coral/reef with 35''T-5, 9w uv on the drain hose, very large diy skimmer on a map 9 pump, old eheim return pump. A few questions before I start. First off, do I need to cycle my water if my old live rocks has been in tub with flow for a month? I see snails, crabs, pods in the tub. The sand is rinsed till no smell, though life has died off. I've been recommended to have 6'' sand bed. Also, should I dip the live rocks in f/w to rid of unwanted pests, especially crabs? I had a lot of fish casualties, especially small ones like chromis, still don't know what it is. Anyways, I 'm thinking snails in the main and crabs in the refugium/sump. Basically looking assurance and some advice.