Easiest Invertebrate to Breed?

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Aspect

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Hello, I am getting a decent sized tank and sump from a friend who is getting out of the hobby. I will be running them in the basement below my DT. I am going to make it a large refugium/macroalgae grow out tank. I would also like to breed small inverts for a live food supply for my main tank. Please let me know what invert is the easiest to breed?
 
Hello, I am getting a decent sized tank and sump from a friend who is getting out of the hobby. I will be running them in the basement below my DT. I am going to make it a large refugium/macroalgae grow out tank. I would also like to breed small inverts for a live food supply for my main tank. Please let me know what invert is the easiest to breed?
collanista snails
cleaner shrimp
 
Well hopefully someone with more experience will chime in, but - aside from various pods, BBS, etc. - there are a few relatively easy to breed shrimp species (Palaemonetes pugio, Palaemonetes vulgaris, Palaemon elegans, and even a few peppermint shrimp species - Lysmata spp. - to name a few) and - if you can get them spawning - red-ridged clinging crabs/ruby red crabs, Mithraculus forceps are easy too (green emerald crabs, Mithraculus sculptus, are just as easy to breed/rear, but they have much lower larval survival rates). Arrow crabs, Stenorhynchus seticornis, are similarly easy as well, but I don’t remember their survival rates at the moment.

As far as snails go, they range from a bit to a lot more intensive to raise, but stomatella snails, as I understand it, reproduce readily enough in our tanks (most people get them as hitchhikers, but there is a place that sells them - I can’t vouch for them being reputable as I haven’t purchased anything from them and don’t know anyone who has, but they say they offer them*). If you’re willing to spend a bit more, you could try raising Nassarius reticulatus using SHG’s “Snow Reef” suspension feed or Cerith spp. using Oocystis spp. phyto. If you’re up for a bit more effort you could try Florida Fighting Conch, Strombus alatus, too.

Fair warning, however, to my knowledge, all of these species (except the stomatella snails) produce pelagic/planktonic larvae, so you need to make sure your setup is pelagic larvae safe, or these guys will all die off.

* The stomatella shop:
Some relevant links:
 
I had 4 Banded Trochus snails breed into 145 snails over a 2 year period. LFS credit FTW!
 

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