07-15-2011, 07:23 PM
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Originally Posted by onefish2fish
i would also suggest sand over the crushed coral, even in your refuge.
after re-reading what i had wrote this sounds alittle mis-leading. i do NOT mean adding crushed coral, then filling in the cracks with sand on top. i do mean that using sand instead of crushed coral IMO provides better long term results.
as for the size, this will depend really on what you want your sump to do for you, what you want it to fit in it, and the space you can afford for one. a 20 long or 30 gallon tank would be a good sump, but the larger it is, your only adding more water volume to your overall system creating more stability. larger does have downfalls though, as more surface area = more evaporation, larger water changes/doses, and may take more to keep your temps right ( depending where you are in the world )