Algae and Moss on Greenhouse floor
I had a 6x8 aluminium greenhouse erected 18 months ago. It's on a new concrete base specifically made for it. The base is level and smooth.
I employed a professional greenhouse engineer to put it up.
Since then the floor floods whenever it rains hard and the wet floor is covered in soggy algae . I Have 3 automatic vents so it's not coming in through the roof [I've watched it!] The water seems to seep under the base and sit on the floor - when it gets warm again then the film of stagnant water grows moss and algae and I have to keep scraping it off.
Should I somehow seal the tiny gap between the base and frame to stop the water creeping in? Should this have been done when the structure was put up?
Thanks for any information!