Hydroid eating nudibranchs

[reef fool]

I have a hydroid problem that is driving me nuts. They are brown fuzzy hydroids. they have been overtaking my zoo polyps. I have been pulling them out by hand and twice as many seem to come to their funeral.
I have found that, besides key hole limpets that may eat SPS coral, there is a nudibranch that eats this specific hydroid only. As far as Julian Sprungs book, "Corals, A Quick Reference Guide" says, they are also easily aquacultured!
Does anyone know of a place to purchase these?
Here is a picture that I took off the net.

 

[greatfullreefer]

Cute looking critter, what will you do when his food supply is gone?

 

[reef fool]

I actually have an extra tank in my system to keep them seperate from the main reef and keep them living for a while.