Help me choose invert stocking!

Betta132

New member
I have a 29g Biocube that's being turned into a macroalgae tank. Due to it being kind of old and also due to a tank crash at one point, it has VERY few inverts. Two, possibly. A nice tiger pistol shrimp and a sand snail, though I rarely see the sand snail. It may not be here any more... I can't tell.
I want to keep the tank lightly stocked, but I'm looking for more inverts Now, here's an issue; I may add a rooster waspfish. No shrimp considerably under 2" is going to survive a waspfish, although I'm still unsure of whether or not I'm getting the wasp.
The tank currently has chaeto, some sort of slightly calcified red macroalgae, C. Prolifera, and some kind of red macroalgae that creeps around and looks like a lot of teensy transparent rose petals. I'm going to add some feather caulerpa and possibly some dragon's tongue.

Requirements for an invert:
Can't eat either of the red macros (okay if it nibbles on the caulerpas or the chaeto, so long as it doesn't gobble)
Can't be dangerous to small fish
Won't eat my zooanthids
Can't be uber-sensitive
Shouldn't require too much extra care- I don't mind offering it food now and then, but I don't want to be dosing plankton a whole lot. If I could buy a bottle of something and feed it once a day or so, that would be alright.
Not too horribly expensive
No emerald crabs- I'm not risking it

Current stock:
One yellowtail blue damsel (bit of a booger sometimes)
One Wheeler's shrimpgoby
One tiger pistol shrimp

Ideas:
Porcelain crab - how can you tell if it's one of the anemone ones or not?
Scarlet skunk cleaner shrimp
Some kind of hermit crab - what do you suggest? I just want a couple to watch, perhaps
I bet I can find a huge spaghetti worm somewhere!
We're going down to the beach in a couple of months. I plan to gather some of the shrimp that come in with the seaweed.
If I can find one, I'm thinking of a single big food-type shrimp
A few more sand snails- how many? I don't want to have them bother the pistol too much.
Maybe a small colorful tubeworm? Is my tank too small?
Another tiger pistol shrimp - I want to see if they'll use teamwork!
Limpets- where can I pick up a few?
Smaller snails, perhaps stars... How many do you suggest? What kind won't eat my macros?
Acropora crabs- tiny things, I've seen a few. Do they need hard corals to survive?
I'm thinking of getting a squat lobster... Any experience with them and fish? Do they constantly hide?

Any other recommendations? I'm open to any and all suggestions/advice.
 
My blue leg hermits are very amusing to watch. I have quite a few blue and red leg hermits and they are definitely my favorite inverts. The blue leg hermits seem to be more aggressive than the red legs, they are always having battles amongst each other. I have a cool video i'll have to find later with 3 blue leg hermits having a serious rumble. Currently I have 1 blue in a turbo snail shell he hijacked, 1 in a nassarius shell, and 1 red leg in a trochus shell. I added around 10-15 empty shells for the hermits to move into but I've yet to see one move in. They seem to like to murder my snails for homes instead.
 
I don't currently have any snails. Maybe I'll get just one or two hermits so that they don't kill off whatever snails I get...
 
In terms of contribution to your tank cleaning duties, I think the snails are probably more efficient at keeping things tidy. Hermits, at least for me, are way more entertaining to watch and have quite a cool personality to me. I really like observing all their goofy behavior. Yesterday I had to separate another 3 way fight going on, two larger blue legs were ganging up on a third and dangerously close to ripping him out of his shell. I grabbed the largest by his shell with some tongs (he didn't let go of the victim) and moved the two of them about 12-16" away from the 2nd aggressor. The lone blue leg proceeded to charge over to the other 2 and resume fighting.
 
I've added a few cleaners:
Two margerita snails (small, round, black, white ring on shell)
Two trochus (I think)
Three sand snails that I can't spell (nasswhatevers)
Two of those little redleg hermits
 
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