Hi Tony, good choice on a skimmer. You'll love it once its set.
1. The pipe only needs to extend to the edge of the chamber. You'll get enough action inside without extending into the center.
2. Straight in is fine.
3. ASM G1's are designed to run in 8" or less of water, so raise it up high enough that the pump stays submerged.
4. The initial setting should be the return line set to the level of the bottom of the collection cup. The foam on the pipe is meant to catch any bubbles that spill over. Like any skimmer, it will need a few days to settle in. The micro bubbles will settle down in time.
5. Don't put an extension on the return pipe. A Sedra 3500 is bigger than the skimmer should have in the first place (manufacturer recommends a Sedra 2500. I've talked to Mike and Ted, the owners, and they know how to build these things well)
Hope that helps.
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