My green BTA has been in my tank for about 2 weeks. When I bought him he was a lot greener, but is slowly getting his color back. Over the last two days, he has deflated his tenacles completely, Im saying that the tenacles just lay on his mouth, then about 3 hours later he returns more bulbous than ever. This has happened 3 times over the last 2 days. Is there a problem or is this normal?