I had a 55 and a 75 gallon tank, I would always lose my fish to disease and parasites, ich management just wasn't working for me. I set up a 180 gallon tank and switched to prevention and it's been working great for me. Before I put any fish in my 180, I took all the coral out of my 75 gallon tank and put it in my 180, my 180 ran with just my corals and inverts for 90 days which was my fallow period, I chose to go longer than 76 days which is the minimum fallow period recommended. I used my old 75 gallon tank to quarantine the fish I had left from the crash, I used to quarantine my own fish but work takes too much of my time nowadays so I switched to buying my fish from trusted websites. Dr reefs quarantined fish and tsm aquatics are the websites I reccomend, tsm also sells quarantined coral!! Anything wet needs to be quarantined, the way you do that is by placing it in a system with no fish in it for a minimum of 76 days. I have a frag tank with no fish in it, all my coral and inverts go into that for 90 days prior to going into my display tank. Ich needs to come off a host which is a fish and encyst, the eggs are what you have to watch out for when introducing anything wet that's not a fish into the tank, it will hatch in your tank and find your fish and will continue its life cycle in your tank. The fish can be quarantined and cleared of ich and velvet with medications but you can't treat coral, snails, rocks, etc with medication so it needs to be in a fishless system for 76 days minimum. Sorry for the long response but if you have more questions I'll be more than happy to help.
