I'm thinking of starting another tank after the holiday season is over (now that I've upgraded my 29g to a 75g ) and was wondering what the perfect setup would be for some brackish (or saltwater?) crabs and shrimp? This will be a purely invert setup (unless fish would be beneficial). I would love to get a "low profile" type aquarium, if available. Would these be okay? By low profile I mean 6-8inches tall vs full on 1ft-2ft aquarium height. Also, what are some good crabs and shrimp to stock it with? I would like to keep the top open but some shrimp sure are jumpy! I was tempted to start a large saltwater tank but it seems to be a little too much for me. I don't make it home some days and having two tanks to look after on a daily basis would be too much. From what I've read, an invert tank doesn't need much looking after so it would be perfect. EDIT: I was also curious as to what kind of filtration would be required? If there are enough bacteria in the substrate and the tank is planted, would a filter even be needed?