What you know, you know. Think here among many people who take the time to know this premise may be truer. Than among the imo much larger population of reefers who don’t know, and depend on half truths, myths, and they mix up good advice from different ppl who use dif methods, which leads them to get frustrated and give up.I will post a picture (if I can find it) of my tank from 1978 or so. With live rock from Florida. When we moved - the tank had to be taken down. My current tank has some rock thats about 20 years old (I added to it when I got a larger system). I believe the purple tang in my tank is about 10 or so years old. I lost a lot of old coral and fish during a 24 hour power failure that happened when we were on vacation. The point being - lots of people have 'done this a long time' - And, IMHO, the reason people don't have tanks that are 40 years old is not because they are constantly 'failing' - its at least in part due to the fact that things happen - they move, have to stop for a bit due to where they are living, etc. Having a tank or part of a tank - for 40 years is certainly an accomplishment. Not having one - is not an 'indictment' IMHO