I would definitely ask to see it filled. If you're happy with what you see then take it home! Give it a good cleaning (I clean my tanks with water/vinegar) and be a proud owner of a 225g aquarium
I would strip the silicone and reseal i tried this with a 20 gal tank that housed a gecko and couldnt keep fish alive for any length of time.......i striped and resealed it and haventt had a problem since