I've had trouble with nitrates for quite a long time so I put in an algae scrubber a couple weeks ago. I know it has a curing period but it has been slow going, it just turned green a few days ago. Thing is, in a week I have to leave for a few days to a week and I'm concerned that leaving the scrubber at this point could harm my tank? Currently the screen is green, but no strands or anything, with a few spots of dark brown (diatoms maybe?). My LFS said to leave the lights on 24 hrs while I was gone to prevent pH fluctuation. Is this right?