Quick, RBTA moving toward overflow, what should i do?

Short story, had this bta for about 1 and a half weeks and he stayed put to the spot where he moved to since then. Hes been open and looking happy everyday and took the mysis shrimp the 3 times ive fed him. As i come down to eat dinner i see him a couple inches away from the overflow holes.

My tank is a 56 galloon with center overflow has been up for about 6 years now nothing else seems to be off. I have 2 kessil A150w running. The original spot was in a deep cave where i think it didnt get too much light
 
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