Biggest changes. There is more info being shared. Thats helps everyone in the hobby. I didn't know there were so many people in the hobby as there is now. I didn't know anything about ro/di water back then. We took water strate from the fauceit,put clorine remover and added salt. in it and added it to the tank we were always fighting alge. We never new wear we were getting it from,then we find out there are phosphates in the water. The test kits, the only thing you tested for was ammonia,nitrites,nitrates, and copper. One biggist change i notice is lighting there is so many different one's to choose from,the live sand the live rock they were just starting with that back then, when you would get it,it wasen't cured like know then you added it to the tank and ammonia spike,as a matter of fact i ordered my first peace of live riock from Hawiaii before they closed off Hawiaii. I started my first tank in 1990 it was 55 gal. reef we had to wait 2 months just for the tank to cycle. It seemed like eternity. All you started with was a few damsels. You didn't dare to put corols in the tank. I did water changes every weekend 10 %. Like i said now the day after you are adding corols and nice fish into the tank. We didn't have cal. reactors,no protien skimmers it took what seems like forever to build coroline now within a month or so your tank is full of coriline and looks like it has been around for a year or so. I think kent was just starting with supplements. Now you have so many supplements so many different companies making them it's hard to go wrong with any supplement from any major company. Feeding corols and fish i use to go to the store and get one or two pcs. of shrimp and cut it up into tiny peaces and feed them or use brian shrimp or flake food. Back then we didn't know what sps's were. This is a great hobby there is a lot of opinions out there and you have to read look and listen. Then take what you here and put it all together and use what works for you ,and get the results that you have and what you are sharing with all of us on reef central. Like i said looks great. I also like the eel. I had one back in 1990. Like i said looks great keep up the good work.