Me gf had Marine, and tropical, but as said Marine very hard in comparison, she had 2 tanks
both 10x3x3(feet), but had to build special bases etc due to the weight, looks awsome when ok though, tanks were I think started with a dead fish to get algae going, before fish were introduced, but long time ago now, she had these before I met her, so don't know much, other than what she's mentioned particularly about cost.
tabetha