Always something new - just got done treating Cyano and now I have these oddities pop up in just one of my overflows Pic 2 is some sort of spiderweb-ish growth Pic 3 I believe are sponges Pic 4 I believe is sporoid snail - hard and spirally on the glass I have searched everywhere else in the other overflow, the sumps, the tank The other overflow has some sponges and the spirally things but not the webs. Parameters are stable at these numbers. Any insight would be appreciated No changes recently other than one round of Chemi-clean followed by 30 gallon water change almost 2 weeks ago