i have very nasty crap in my sump. i have some cyano some brown hairy algea type thing i forget the name of. and in the walls of my refuge only i have green slime algea, cyano, more brown hairy algea and these nasty bubble things. looks like a poluted water dump in the fuge. i added macro algea and a green grape vine looking plant or algea that i also forget the name of but its good to feed my tangs, about 2 weeks ago and added chaeto this weekend. but my question is what are those nasty looking bubbles? i dont have any in the display tank but hoping it wont get to the display tank. tank is 6 months old. sump is about 3. alli have in my tank is some diatom lightly spread on my sand bed. any thoughts?