You want to know how to care for a tube anemone in a new 35 gal
tank that has 3 Tangs and at least some Chromis? Every time someone asks questions such as tank size, lights or nitrogen levels you start a new thread instead.
Here's my personal recommendation, take it for what it's worth because I have neither Tangs nor anemones in my tank because it's only 110 gals (too small for tangs) and only 5 months old (too new for anemones); take you tangs and anemones back to your LFS
and hope they are still healthy enough for a refund.