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Tired

ReefCleaners micro decorator crab info thread

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Tired

I don't have a plastic ruler that's not also a hole punch (and therefore very bulky), so here's some size comparison pics with a clean dime. I wouldn't leave a dime in the tank, but I can't imagine saltwater being corrosive enough that a dime will leach anything into the tank in 30 seconds. For folks who don't live in the US, a dime is 18mm across. 

Water magnifies things pretty considerably. I genuinely thought he would be bigger compared to the coin, from how he looks. Nope! He's still pretty small. 

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Amphrites

You gunna' eat that dime?

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Tired

He tried! Then he evidently realized it wasn't food, and walked away to sulk about it. 

 

Also, assuming these can be sexed the same way as other crabs, this is definitely a male. I had a look at the empty shell. 

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Tired

 

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....that frag is supposed to have 4 polyps on it. 

 

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Sir, please do not snip my zoanthids to wear. Sir. Those aren't even the small ones, those are a medium-sized polyp. 

 

So, yeah, these will apparently wear zoanthids. Hopefully it only wanted a couple and won't go bother something else. We'll see if the ones on its back survive- they do not appear to have been very neatly fragged, there are kinda some stubs left. Normally I might think the stubs could grow into new polyps, but I have amphipods that swarm anything that's remotely upset, so they'll probably be devoured. Least I have one healthy one, possibly two? They keep getting walked on and annoyed into closing again, so it's hard to check. 

 

I'm still keeping these. They're cool. But apparently I should try to avoid frags with just a couple polyps, and/or put those up out of reach. Maybe I can temporarily glue little frags to the back of the tank until they get a bit bigger? Decorator crabs can't climb smooth surfaces. 

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billygoat

The stubs are likely to regrow at least? Zoanthids are damn hard to kill. But still, I can see that being pretty annoying... although if it happened in my tank I wouldn't be too upset. I've got zoanthids coming out of my ears these days. 🙄

 

These little crabs are pretty dang cool. I'm thinking of getting a few more now that the Maw is no longer around to eat them.

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Tired

Yeah, I think if the amphipods don't chew the stubs into nothing, they'll regrow. At least it was the no-name (but pretty) zoa I have several of, and not one of my couple named frags that have one polyp and a bud. 

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This is them before being rudely fragged. There's now one intact polyp, one that I think he got some frill off of, and a baby polyp that looks intact.

If he does this again, I hope I can at least film it. I'd let him, if it was one of the things I have extra polyps of, to see what happens. Must have taken some effort, though! These guys are decently thick, his little claws look too small to get them off. 

 

I do suggest getting some, if you can. Though I'll tell you that they're now under the same listing as the mime crabs on ReefCleaners, as in the listing is for either/or. I'm not sure why. You might want to email ahead and ask if they have any decorator crabs, and if they could send specifically those. Or, I know they sell regular-sized decorator crabs, you could always just try one of those. Since everything wear-able in your tank is either an excess of zoanthids, or a macro that could handle being fragged. 

I've gotten two mime crabs from RC, also. One has a shell the size of a split pea, and I'm pretty sure by the fact it came in with eggs that it's a full-grown adult. I've seen it once since adding it. I don't know its name. The other is a heart mime crab, carapace maybe 1/4" across? And I've actually seen it a few times, wandering around, but it would probably vanish in a non-pico. It lives under an overhang by my hair-algae-covered fire fern and grabs with remarkable vigor at any food I put near it. That one might grow bigger, I'm not sure. 

 

These guys are, I'm very sure, not remotely predatory. They're bad at catching frozen mysis, for crying out loud. I have to deliberately feed them with tweezers, because if I squirt a mysis shrimp at them, they can't reliably catch it. My trimma goby briefly sat on one with no problems. I can't imagine they could threaten anything mobile, short of, maybe, a very small dying fish. Or a particularly stupid amphipod. I saw a video where a decorator crab caught and ate an amphipod that landed on its back, but I can't really picture mine doing that. 

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Tired

Those zoas, shockingly, didn't survive. Didn't even open up. I don't know if the crab removed them, or if the amphipods ate them. Crab hasn't touched zoas yet, so it looks like these might experiment with zoas, find it unsatisfactory, and stop there? Which is good. 

 

Oh, and someone got excited during feeding time, somehow climbed onto a nerite snail, and gave me a good opportunity to measure. 

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Still a pretty small crab. This one's a male, if the usual method of sexing crabs (shape of the tail) works on these. The detritus on the belly seems to be intentional, it won't blow off. 

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