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i do not know if i would toss the idea of a filter and skimmer...i think you would have to do many water changes without..but i am no expert on that. i do know however that crabs and shrimp need iodine to help them shed. so if the salt you use does not have enough you may need to get an additive..i made that mistake when i first set up a tank and couldnt figure out why they kept dying on me. and for how much rock i have been told about a 1/2 a pound per gallon
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