you have too much light, too much bio load and CO2 tank empty. Just the right combination for green water
Reduce your light to 1x24W tube until you refill your CO2. 2x24W is normally enough for tank your size unless you know what you are doing. What plant that you have? Fast growing plant will help but since no CO2 it will be pointless. Add floating plant since it take CO2 from air.
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