it sounds like you have a algea break out for what ever reason... test your water but for the most part your nitrates and phosphate test wont be correct do to the algea eating it all up.
Do you have a protien skimmer? what kind of filtration are you running?
what kind of live stock do you have? size of tank ect...
i would keep your lights off
get another water change ready
run carbon and filter floss