I bought a Fromia starfish 2 weeks ago and ever since then it has been active but is always at the top of my tank. The water readings are normal and I drip acclimated it for 6hours. I'm just wondering what it means if it's always at the top. It is a problem for me to do water changes, I've tried to gently touch it to see if it will let go of the glass but it is stuck very tight and hence I do not want to damage it. Thanks for your advice in advance!