i'm going to upgrade to about a 110-135 gal tank. normal glass rectangular for my pygo shoal with a stand and all that. i was thinking probably add a nice size wet dry this time instead of hanging power filters(unless i can just use my two ac 500's), that's open to suggestion. my question is: you can get large tanks normal, drilled, with overflow already, etc. etc. what's the deal there? if you want to use canister or wet dry beneath do you need drilled or overflow, or is it just aesthetics that help hide equipment? should i just get a normal unmodified tank, or do i want one with all those spicy mods? someone help please. i've seen members with both. what's the deal.