Usefullness of sand sifting cucumbers?

[saltyrockbox]

Sand sifting cucumbers like these

http://www.jlaquatics.com/phpstore/s...t_ID=i-ccbknob

my sand is always dirty and I have been sucking it out moving towards bare bottom tank but I actually like it and was thinking that I should have just got some animals to clean it. I was going to get a golby but I was told that they will drop sand over all the corals>

what about these cucumbers are they a good addition for a sand aquarium??

Has anyone seen them foe sale in Calgary?