i'm filling my 180g gallon aquarium(6'x2'x2') up with about 8" of water and want to put a couple of islands in by putting eggcrate on top of pvc legs and putting peatmoss and gravel on top of that as well as some live plants. i'm wondering how much land area i should have? in one corner i was thinking about doing an area roughly 2sq feet and then a couple of smaller islands maybe 1/2sq foot and 1sq foot in size.

