So my last tank is officially taken down and out of commission. I essentially shut it down and never broke it down, because I was tired of dealing with ich. I’m now attempting to do this with as much thought and thoroughness as I can. To prevent any losses in the new tank I’m setting up. I’m planning on buying sand and everything tomorrow. Ich can come in on live sand, live rock, he’ll probably even dry rock. I know fish, corals etc etc need to be put into a QT for specified amounts of time. But I still need to start the cycle of my tank. my question is: how can I prevent ich and velvet from entering the system all together? Will I need to add the live sand and rock; and allowing the tank to cycle for up too 10 weeks to completely Ensure nothing will happen to the first fish I add, after they themselves are isolated and treated in a QT? And if this is the case should I add my CUC at the same time roughly (give or take a week) as I do my sand and rock? As well; regrettably my last tank sat for about 5 months with partial water and no fish. Is the live rock and sand, safe for use in the new aquarium? I figure either way it’s going to need to start over from scratch with a fallow period and QT fish. none the less all replies I appreciate and will read every single one. Thank you very much and sorry for the long post.