Has anyone tryed a system with fish and crabs? And I mean crabs that you can eat, or size enough to eat. I don't know a lot about crabs. I'm just trying to find out if I can put more then fish in to grow reproduce and eat into the system.

edit :

better yet here is a list of low mercury fish/sea life. Wondering what you can mix and match basicly.

Anchovies, Catfish, Clam, Crab, Crawfish, Flounder, Haddock, Herring, Mackerel, Mullet
Oyster
Perch
Pollock
Salmon
Sardine
Scallop
Shrimp
Sole
Squid
Tilapia
Trout
Whitefish