Lta ( PLEASE HELP QUICK QUESTION)

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I HAVE HAD A LTA IN MY 29 REEF TANK FOR ABOUT 4 MONTHS NOW. HE EATS WHOLE SILIVERSIDES AND IS YELLOWISH IN COLOR. WHEN I BOUGHT HIM HE WAS COMPLETLY WHITE ( BLEACHED ) BUT NOW HASNT GOTTEN ANY DARKER COLOR IN A WHILE. FOR THE FIRST TIME SINE I GOT HIM HE IS NOW STASTED TO MOVE. IM AFRAID HE DOESNT HAVE ENOUGH LIGHT AT THE BOTTOM OF MY TANK AS I ONLY HAVE 130 WATTS OF PC LIGHTING. SO MY QUESTION IS AN I FILL A JAR FULL OF SAND AND PUT HIM IN THAT THEN PUT THE JAR LOSE TO THE LIGHTS AND HIDE THE JAR THOUGH. PLEASE HELP