Overnight losses like that means you still have a source of algae that's not been killed. Light niches, corners, overhangs, ladders. ANYTHING with a nook or cranny that may allow algae to hide and has not been scrubbed. Leave no stone unturned, figuratively speaking.
# Sent from mobile device. Beware of brevity and spelling errors!
# Sent from mobile device. Beware of brevity and spelling errors!