Cleanup crew recommendations?

[serisash]

I'm trying to deal with a red algae problem and as part of that, I've realized that the number of crabs and snails in my 125 gallon reef has been greatly diminished. I can easily find like 2 crabs now. So I'm thinking it's time to replenish my cleanup crabs 'n snails.

I've purchased them online from a number of sources, including purchasing the recommended critters from GARF at one time long ago. Since these forums are an eternal font of information, I was wondering if anyone here has recommendations for places to order cleanup crews from. Price is a big component for me, but so is getting the right kinds of cleanup animals. I see a lot of sites making claims about how "this crab eats this" and "this snail eats that", but it's not clear that these claims are universally accepted so I'm skeptical of relying on the claims of a particular vendor.

Also, what's the rule of thumb for number of critters for my 125 gallon tank? I think I've seen it mentioned in terms of pounds of live rock, but I really have no idea how much I have. I do have a 4-5" DSB and plenty of live rock, but not live rock stacked to the top of the tank or anything (I can see the back of the tank :-) ).

Thanks

Mark