I’m also a new reef tank owner. I bought a used Fluval 13.5 that was up and running for a couple of years. I thought it was a good idea because it was already cycled and I could start reefing immediately. I have already tripled the price with light, return pump, ATO, heater and controller, skimmer, UV light, wave pump upgrades or add ons. I have a pair of Mocha Clowns, a pair of Yellow Watchman Gobies, a pistol shrimp, maxima clam, 2 fire shrimp, anemone, a Royal Gramma and about 30 coral frags. I am very happy with the look now but everything in it is small, neat and tidy, playing nice with each other. It was nice size tank to get started but will probably be hard to keep water stability and will be very crowded quickly. I am already wishing I had a bigger tank with more water volume. I have already chosen to go with an Innovative Marine tank