Okay I have a problem with my camera

I don't have much growth on the screen yet. I have cleaned it once now, and checked it today there seems to be more growth but nothing like thick long strands of algae more like a fine green coating. I still only have the CUC in the tank, so Im guessing that there is no load on the tank?
I am getting some micro bubbles in the DT. Should the drain from the scrubber be submerged in the sump water or should it sort of splash into the sump? (mine is splashing) I did put a nylon strainer bag on the end of the drain tube but it is collecting algae, I think that is not a good idea? But it did help with the bubbles.
If the drain tube is submerged will it back up into the screen chamber?
There is MUCH less algae in the DT !
There is a direct relation connecting the decline of pirates and the increase of global warming