So I've attached a battery powered air pump now pumping into the tanks to see if this helps tempted to put a sponge filter in and start a cycle to see if that does it what you guys think ?
If there are no fish you don't need to cycle it. With a lot of plants, bacteria won't grow anyway as when there is a source of ammonia (fish) the plants will take it up before the bacteria have chance.
I was tempted to put some tempered fish in there like cloud minnows or something so it's basically a pond as my aquariums grow plants like crazy but it's slow out there compared to inside maybe it's the fish that is missing