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Cheapest sand is at Home depot. $3.99 a bag. Anyone of us reefers will give you some live sand to seed it. If you're close enough to me in Middletown, I can also give you some brillo algea with tons of critters in it.
Yes, the air leaks will cause bubbles in you're display tank.
I would put a T and return some of you're water back to the sump. You don't want to restrict the flow coming from you're return pump. It will cause premature pump failure.
Hi Carlo. A Sunday would be good for me to look at you're floor structure. Just give me a weeks notice in advance. I've been building homes for 30 years.
Mike