Removing Uneaten BBS

[Europhyllia]

Okay so for my type of fry it's important to enrich them or else they are not sufficient (actually there's some discussion that copepods are the only truly sufficient food for my type of fry)
So I enrich the BBS and place them in the fry tub.
I clean off whatever is on the floor, etc.
But now I can see a fairly noticable BBS population in the fry tub. And I'm assuming they have by now used up all enrichment.
So how do people get the BBS back out when they are just free swimming?

[BSJF]

I think siphoning them is your best bet. You could use a sieve so you can reuse water if you need to.