I've been out of the hobby for a while and I'm finally diving back in with a 210 (72 x 24 x 24) Gallon in wall setup. I know the larger the sump the better but due to the setup the larger the sump the less room I'll have for other equipment. I'm thinking of using a standard 90 Gallon (48 x 18 x 21) as a sump. What do you guys think?