I've been keeping tanks, and nems, for a decent amount of time. I have a large reef, and a 12 gallon cube. In my 12 gallon cube, I've kept a LTA and her two picassos, for 3 months, prior to moving them into the larger tank. Everyone was happy, and given the small volume, I was able to perform quick easy waterchanges without worry. I've also kept RBTA's (with 2 picassos, not hosting... ggrrrr.) and GBTA's (with 2 picassos hosting) in my 12. Hahahahahaha before someone goes over the top with this, NO it was not all at the same time!!! LMAO. I've been doing this thing for a while
I would NEVER try a carpet in there... for alot of reasons.
1. They aren't aquacultured. And small tanks can go downhill quick if you don't stay on top of it. I can swallow losing a bta clone, but a carpet

that's a shame!!! The big thing here is that they are literally dirty bags of water. Just don't do it. Carpets, at this point, are not aquacultured, so we are pulling them out of the ocean. It's not worth the risk.
2. They are HUGE!!! Even if you get a small one.. it's bigger than you think LMAO. The 7" gig that I ordered from the LFS (trusted, GREAT LFS) turned out to be 13" when happy.
3. The acclimation process is much more difficult for carpets than for LTA's or BTA's. It needs the larger water volume to dilute any wastes expelled. I run a EuroReef skimmer on my 12. It still had trouble keeping up when I target fed the LTA and the larger GBTA (again, not in the tank at the same time!!! LOL) My gig did not go through the expelling and deflating process but it is VERY common. I got lucky. We get sometimes get lucky in this hobby and tend to think it's talent.
4. Given the flow necessary for a gig, I would think the powerhead options in a 12 to get that flow would be dangerous... Big nem, powerhead.... = disaster!!! I have a mp 10 in my 12, smaller footprint, and still, I wouldn't chance a carpet in there. Or the LTA for that matter. But a bta or lta doesn't need as much flow.
So, now, what am I saying? It doesn't make sense. My LTA was happy in the cube for a while, but I had a ready home, in the larger reef. It grew quickly. And it's much happier in the 180. But it CAN be done. Even though it's not supposed to be a natural host for percs, mine (tank bred) are in it like glue. Now they all three live in the 180. On the other hand, I've had a gig in the 180 for almost a month, and I think it's doing well. I'm hoping the picassos jump ship from the LTA and move into the gig (natural host.)
If it was me, and I didn't have a larger tank, only the 12, I'd do a rbta or gbta with itty bitty baby clowns. Another pair of clowns I had, loved to host frogspawn
I don't see anything wrong with passing along an animal, if that's your kind of thing. Mine are kind of like family pets though. I hate my mag fox, but he's part of the family. He's not going anywhere. But if you can find it another home, and you are doing your best to make sure it goes to a good home.. why not? If my clowns go to the gig, I already have another reefer lined up for the LTA.
