Babylonia formosae in seahorse tank?
 

These are a welk sometimes misnamed nassarius.

Reports are they eat left over and stir the sand. If starved eat other snails.

Anyone try them in a seahorse tank where there is always food laying around to clean up?

Do you think they would be a danger to the horses or a dragonface pipfish?

Sorry I know nothing about them. However, I question the remark about "always food laying around to clean up".
IMO, for me, it is best to siphon out any remaining food/detritus each day as I broadcast feed. Many others choose to use a feeding dish but uneaten food in the dish should be removed before anything is added.

Regular ol' nassarius snails work pretty well at getting uneaten food, mine used to come rushing out of the sand as soon as anything touched the water.

Yes I remove obvious uneaten food. I'm currently spot feeding as one of mine isn't trained to the feeder YET. They are new and I'm working on it. I meant the piece that floats away or the ting masticated pieces that come out of the horses.

I've never used a cleanup crew in any of my tanks, reef or seahorse, for at least 24 yrs now. I much prefer to use fine mechanical filtration that I can clean out simply and frequently, coupled with water movement to keep the crap in suspension long enough to be trapped by the filters. Of course, an oversized protein skimmer can be invaluable in removing dissolved organics.
Unfortunately for my tanks, I can never get all of the seahorses to feed at a dish so I end up broadcast feeding anyway.

Just a follow up. I've had the Babylonia formosae in my tank now for a month and it seems well behaved. It cleans up, it also stirs not just my sand but the area I have that is gravelly.

follow up. Still well behaved. Part of the clean up crew.