i had a BTA for about 9 months.. the first day i put him in my tank....he never moved... i guess he thought the spot was perfect for him... after about 7 months, i put in some blue lcd night lights, and that same night it started moving... i asked my local fish guy who i purchased it off of, said that the night light shouldn't affect it, but i still think it did...and then my daughter was born, and i slacked bad on my tank.. and it died... i still feel badly, esp since it took about 4 months for my clown fish to pair up with it....and now the clown looks lost with out it. ill get another one in a month after i move my tank to another room....