I bought a rose BTA from a lfs a month ago and it has been doing great. Readily eating pieces of shrimp i feed a couple times weekly, and expanding to about 5 inches with great bubbles. However I notice that when he really stretches out, if you look close you can see through the orange tentacles and barley see the back of the tank. Is this normal? Or is it starting to bleach? I'm slightly concerned my lighting might not be strong enough, it is a current usa orbit marine led and the nem is about 18 inches deep into the tank. Weekly 10% water changes. Tank parameters are sg 1.024, alk 8 ph 8.4 ammonia 0 nitrite 0 nitrate 5.