Looks like it is pretty bleached out and really reaching for the light. If you can move the rock it is on, put it in an area of lower flow with excellent lighting, and feed it if you have not already done so.
I've never had a BTA but 18 inches is pretty deep for T5s to penetrate and I think BTAs like allot of light. I'd move him up to like 6 inches deep. Maybe someone else could comment on whether that's too much increase in light too soon to cause stress... I doubt it is though.
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