I was just reading about pumps like these (two roller type) siphoning back if the rollers don't land in the right position there are ones that have 4 rollers that i would think about using unless your pump is higher then the tank ....just something to think about before buying
Shawn
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150 mixed reef 14 fish 4 shrimp 50+ snails
55 sump long spine urchin 20 snails
Shawn
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