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Fishing line is less weight but it will not hold up over time IME. I just don't like using it. I use 4 very small zip ties that are 18lb test. 3 layers of mesh on the 150 is just fine. The input side of the recirc you may not need to boar out if its opened up enough. I left all the NW's on the back side. You could pop a few off if your worried about weight.
For the 110 i'm sure it will work but i wouldn't add more than 2 layers of mesh on it as its a much smaller pump.
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There's no such thing as a normal reef, there's just reef
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