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1) i chose 90s to get more surface agitation, but 45s should get you the angled flow you want.
2) i have 3/4" return line as well, with 90 split t reducers to 1/2"
3) im going with the low flow principle too. i want to create all my flow via 2 hydor koralia 3s
4) thats a good idea, i am also doing this, though i have threaded 90s
5) Custom Lifereef with the necessary dimensions. they make custom sizes for euro-bracing and non-standard applications.
6) i had originally planned on using a scwd but once i started putting the manifold together i decided that it would just restrict too much flow. even though im going for low flow (<10x) the scwd would have made it considereably less.
good luck with your 20L. i love those tanks. they look much bigger than they actually are.
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-Lewis
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