any recommendations on underwater lighting for a 25,000gal 9 foot deep pond? I like the look of the sacramento koi lights (no cords thrown over the side of the pond) but not the expense or the complexity of the niche/housing for them.

also d/t size and shape and number of jets/drains and due to the fact I already have cement block walls, I am thinking of just going ahead and pouring a concrete slab bottom and using super blockade than to do a huge rubber liner. has anyone ever used this product or do you think its a bad idea not to use a liner.