Have a question for you live bait guys. Anybody using pure oxygen infusion into to their 30 - 50 gallon bait tanks. If so, how well does it work for you? I struggle to keep gizzard shad alive in the hot summer months in the midwest and am considering adding a pure oxygen system to my 30 gal Creekbank shad tank. I see some companies selling "marine" oxygen diffusers for hundreds of dollars but it looks like I can buy basically the same thing on ebay for about 30 bucks. Is there really that much of a difference? Any advice is most appreciated!