I got some button polyps couple of weeks ago. Not all of them have opened and those that havn't have a film on them. At first wasn't too concerned but now some look like they have brown algae. Is this brown jelly? I did a fresh water dip on it when I got it. I have a qt tank but I keep the salinity low cause I use it for fish 1.019. Should I up the salinity and move the polyps? Can't get close enough pic to make out but it looks like brown algae.