I have 6 aiptasia eating Berghia Nudibranchs for sale. 4 are young breeder size around 3/4" long when fully stretched out and they are producing egg strands every night. The other two are a couple weeks younger and about half the size. I raised these in my tank so they will be much hardier than imported ones. These have a very selective diet and will only eat aiptasia so please ensure that you have enough in your tank to keep them alive. They need at least 1 a day and will eat more if available. $30 each or $50/pair.
