Dymax T5.

Heard about this Dymax T5 from the LFS owner 1 month ago, and heard that this batch now is not as easy to blow up compared to the previous one. And there is a garentee of 1 to 1 exchange or exchange to other things, so I would like to ask whether this 2 x 20 watt (for two feet tank, low height type) tube, is it enough to support alvoepora, finger coral, leather mushroom coral, BTA, star polyps, cauli-flower coral and plate coral?

BTA or other anemone confirm not enough. 2x20w think you cant keep anything except fishes. If you get 2 sets then its feasible to keep soft corals but BTA not too sure if its enough.

Don't know about Dymax T5 tubes but for sure other brands of 2ft T5 tubes are rated at 24W.

IMO since you're using a 2ft tank, it should not be a problem as long as the light can penetrate deep down to the tank bottom.

Dymax is not using high output so the tubes are dimmer.