If looks aren't an issue, just some standard stacked cement blocks with rows of 2x4" "shelves" can be pretty practical. I've seen lots of fishrooms utilize racks built that way.
There's also tons of shelving options at Lowes/HD/WalMart you could take a look at. I'd just watch the per shelf weight limits carefully.
There's also tons of shelving options at Lowes/HD/WalMart you could take a look at. I'd just watch the per shelf weight limits carefully.