ok just to wrap this up
I've sold it, tank, hood and the spectacular aquariums background/substrate.
where do I begin? Ah I know ALGAE!
green, slimy, hair, red, black, you name it this tank succumbed to it
I tried everything, even the algae chemical I swear by didn't touch it

water quality, ok at first but deteriorated over the last few months, nitrates were always high and phosphates were inmesurable. No amount of water conditioners, or water changes had any effect on this doomed project.
I have transfered the fish to my 13 gall by doing a bit of swapping around, adding some fish to one tank and others to other tanks.
MY advise
don't waste your money buying one of these things, spend the same amount and get a half decent internal filter.