I also have GBTA in my 36" long tank but it’s a 65 gal (wider and Toller).
I have 6xT5
GBTA has been in my tank for about 4 years now, divided once and doing very well.
IMO if its sits still this is the good sign, I don’t direct feed mine because I want it to stay in its present size, but if it takes food it is also a good sign.
Water quality is very important for BTA's and if its shrinking the first thing I do when I see that is a water change, anemone is an excellent indicator that something is out of order in water.
Some people say the anemones are more sensitive to water quality then SPS and I agree with that.
In terms of lighting your 4xT5 should be ok though if animal moves then something is not right for it, or you changed something like flow patterns for example.
When I started to use NP reducing pellets my GBTA started to show bubble tips, and before that it did not, I don’t know if that’s the cause because I also started to use Zeo Snow and Zeo Bak.
Don’t be paranoid, and leave it alone, make sure there is flow around it not directed at it. Do your water changes. It will be ok.
jmtcw
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