andywatson29, have you kept this particular slug? What are you basing your information on? I'm not trying to be argumentative, I just want to know as the information on some of the species has been conflicting. I had to debate a bit in another forum for the chalk bass. Some people claimed that chalk bass grew to be 6" mosters that ate everything in the tank. That doesn't go with what most the literature says. They were also keeping solitary fish, when the lit says that they are social.
The palatable species of algae on that list are the Acetabularia, Halimeda incrassata, Halimeda discoidea, and the Ochtodes. Elysia crispata, according the lit and the slug forum I visited (yeah, there's a sea slug forum) has a very specialized diet, so why would you think it would go through
all the macro in my tank? Symbiotic plastids from Halimeda incrassata (first macro pictured) is one of the plastids that have been found in the body of the slug. Other species plastids found in the slug include Bryopsis, Derbesia, and Caulerpa, which are not even on my macro list. They don't just eat random algae and are a difficult species to keep alive for an extended period of time. On the flip side, they breed pretty well in the aquarium. If you're going to die, might as well have some fun before you go...
The challenge is figuring out which algae a particular specimen will eat, and then providing it with lots. A challenge to say the least, but a possible one for a mature system. If I found a particular algae that it would eat, that algae would be kept in a refugium type setup where that species could be harvested for the slug.
By all means, if you've got a source that I've not read yet that backs up what you're saying, let me see it, so I can check it with the sources I've read. At any rate, it's a species for a mature tank, not for a new setup, so plenty of time to figure out if it's the correct choice.
The other algae-eater is the Mithrax crab, but no one's said anything about that one, and it also would prefer the Halimeda species and probably the Acetabularia. Probably some of the snails too, but I don't think they'll do the same potential damage.
Liz
EDIT: I don't normally link to another forum, but this is pretty specialized information.
http
/www.seaslugforum.net/showall/elyscris