What size is your tank and how big across is your BTA?
More lighting would be good, but I don't know if it will change colour. I think colour of the BTA is often dependent on the colour of the lighting over the tank.
Also, depending on the size of the BTA, I think you may be feeding it too often. I feed our RBTA and GBTA small portions of finely chopped scallop only once a week. I can post a BTA feeding video if you want.
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