Hi Paul I'm trying to remember when I had my first marine tank. I do remember filling a ten gallon with sea water and bringing home some small gaftop catfish to populate it. That was about 45 years ago. Probably about the time you started yours I had a 55g with undergravel filter before reverse flow became popular. Had dead corals and some plastic lace plants that reached the waters surface. Two peppermint shrimp lived in the tank along with assorted fish. The shrimp would climb the plants to the surface, turn upside down and capture tetra ruby flake food I put in for the fish. Those shrimp turned bright dark red and were the best looking shrimp I've ever seen. At 65 I replaced my 75g tank last year with a 210g that I hope to enjoy for many years to come. I've been retired for five years now, put in my forty as a commercial electrician. I think I still have that 55g tank from forty years ago but it hasn't been used in several years. The 210 I set up with a 75g sump, skimmer, fuge, ato, filter socks. Leds on the tank for lighting. Over the years the hobby has changed plenty, I've gone through five homes and two wives but marine tanks have always been my constant.