[mike31154]

My setup is similar to yours, 75 gal with four 54Watt T5HO lamps, 2 x Actinic & 2x 10,000K. My GBTA has been in the tank for a year & a half and looks much like yours, so I'd say it's nothing to get alarmed about. It should do fine. Mine is higher up on the rock though, around 6 inches above the substrate which is about 4 inches deep average. Probably about a foot below the surface in a 24 inch tall tank.

When I first got it, it was much smaller, quite pale and had bubble tips. At the time I had only a 2 x 39 watt T5HO fixture with one Actinic and one 10,000K lamp. This along with feeding every few days was sufficient for it to grow & colour up within several months. It didn't take very long to lose the bubble tips as it grew and gained colour. The recent upgrade in lighting certainly seems to have benefitted it though.

You might consider finding it a spot a little higher in your tank, but as with most BTAs, it may not stay and move again of its own accord. Again, don't sweat the skinny tentacles too much, it has good colour which is a positive sign.