Bare bottom

, 77F in the winter, up to 82.5F in the middle of the summer. Mysis, larger plankton (Euphausia pacifica), Marine Cuisine, 4-5mm (lees than 1/4") shavings of grocery seafood, no salt or preservatives: salmon, shrimp, baby cuttlefish or octopi (very little, smaller pieces), haddock, mussels; LFS's silversides, krill, same size pieces.
Now take a deep breath, hold it and count to ten before :uzi: me.
Many people kept tube anemones in tubes (referring for details to athiel website and 1924-29 publications on keeping them in glass tubes, available online). Example that I tried to achieve is
here, in the Tube anemone section, where they are in high bowls.
Initially it was housed in plastic tube, slightly wider than anemone diameter, according to
R. Toonen in uplifting flow between and below 2 x600gph powerheads in 90g tank. But: it expended the same night 2.5 times larger, than it was expanded in store, alotted space was too small:

Freed space in opposite end of the tank, moved there. From there it left first time and was sucked in powerhead. Recovered fast.
It moves in the sand, so next time accommodations were betta fish bowl with the same CaribSea Ocean Direct fine sand. Better.

Eventually freed for it quarter of 90g tank, 18" wide:

After adding dendronepthhya and few scleronepthyas, that are sensitive to flow, adjusted flow for them and re-oriented it for swiping detritus from under the rock forward.
Tube anemone went on strike. When I was able to find it and remove from behind of the rock with no access from the top, it was few days not fed, shrunk and miserable looking.
Restored flow, it was pacified again.
Now 90g tank is shut for moving in another place in the room and reaquascaping, and tube anemone is in 12g Nano Cube. At beginning (again, glass is similar to the K.Guba's tank) with power filter:

Left again and tried to hide under the power filter, where flow is not directed top to bottom.
Had to replace it by internals surface skimmer/filter Current, with flex-lock 2 outputs. In the same time tried to make DSB with Tahitian Moon black sand, ~4.5" deep. This sand was disapproved. Returned glass with aragonite sand. It chose to sit between glass and rock.
Tank is 15" wide, and now anemone maximal extension is more. It will need a larger tank. What I would like to know, is how big this kind of anemone will be in 5 yrs - to choose appropriate size. Attempt to exchange it on the smaller one was unsuccessful. But the big one is magnificent under combo PC lights.
Sorry, full 90g tank DSB is not in my plans, but if I'll clean nano next time, I will make DSB with aragonite sand (Ocean Direct).
If shooting me is postponed, I'll appreciate advise on keeping tube anemone in high flow tank, not larger than 90g. Temperature, compatibility with purple-green tube anemones and so on. Ah, and my SG is 1.026.