can you cut a piece of plywood to put under it for now? atleast one thing you have going is that the tank is only 3/4 full.
I think you solved your problem with the dirty film by adding the other light, but if you still get dirt settling onthe plants try putting the spray bar in a different spot. There are really no current requirements for a planted tank, you don't want a current that will uproot plants, but you certainly need some circulation.
As far as the lights go, what's the budget and what type of plants do you want to keep? are you planning on upgrading to a pressurized co2 system?
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