Had this guy for about a month and everything was fine until maybe a week ago it started expanding less and now it just looks like the pic most all of the time. Everything else seems to be happy. I do 20% water changes with LFS RODI water weekly. Is this normal or should I be panicking? Only thing new is I've added some phosguard to try to help with a diatom outbreak. Could that be related? Tank is about 8 weeks old.




