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Yes, the mesh needs to be replaced every now and then, I generally check on mine every few mths and replace as needed. I have one pump going on a year without replacement. The small black piece that goes inside the male volute. The smaller diameter end goes in facing the impeller, larger faces the intake opening. As for a gatevalve mod, i'd let it break in a while first. FWIW, you don't have a riser tube when you have a gate valve, tht is your riser tube. Spider braid fishing line will work better for the sicce as its so light and will help in startup.
Just take a breath man and set it up and see what you have. Like joker has said the 160 does 30scfh or 800lph air......identical to the ati bm 160, along with diameter of body, neck as well. But the Bubble plate looks nicer on these.
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There's no such thing as a normal reef, there's just reef
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