What would be an ideal second tank? I am struggling on going for a the frag tank, pico reef, or a bigger upgrade. I really like the lagoon open top tanks from reef casa, it is an AIO style, going for their pico reef with a small scape and invert only. Or a frag tank dedicated to frags and collecting, possibly trading or swapping or selling, less on the selling more on the trading and collecting aspect. If I did do a frag tank I would want to catalogue ALL the frags that have been through the tank or to organize it all like a giant pokemon collection. But the frag tanks that reef casa seems unreasonbly small in terms of spacing out frags other than LPS. I was also thinking about upgrading to a bigger tank and get some sump experience as I only have a 15 gal with a canister. The larger upgrade I was looking at was a red sea pennisula on a guy through offer up, It would allow me to get more stock, more scape exp, and sump exp with the bigger more expensive equipment. I would like to keep my purchases to a minimum and not spend anywhere near 1000 at the moment,except stocking it. I also have friends in a distributor so hardware upgrades for AIO would not be as expensive hopefully. I just love the way how pico reefs look and aesthetic, frag tanks would be fun to catalogue everything, and a bigger upgrade would allow me to get more knowledge and hands on with hardware/sump exp.