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11/20/2018, 10:02 PM | #1 |
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What kind of crab is this?
Hello folks.
After a little over a year I have a crab invasion in my tank. I was able to capture 4 gorilla with bottles but then the others have gotten smart. Though I think they not gorillas. Most of them are doing some kind of karate move with their dusters. Well, I manage to capture one more and before I decide his fate in want to confirm his intentions. It seems greenish...maybe an emerald? Sent from my SM-N950U using Tapatalk
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[Newbie here so please take my opinions carefully] Current Tank Info: Red Sea Reefer 350 (72G) | Jebao DCT 4000 (1056 GPH Max) | Reef Octopus 152-S | 2 X Jebao PP8 (2100 GPH Max) |
11/20/2018, 11:46 PM | #2 |
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Not mithrax, I think. Claws are outsized and problematic.
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Sk8r Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low. Current Tank Info: 105g AquaVim wedge, yellow tang, sailfin blenny,royal gramma, ocellaris clown pair, yellow watchman, 100 microceriths, 25 tiny hermits, a 4" conch, 1" nassarius, recovering from 2 year hiatus with daily water change of 10%. |
11/21/2018, 04:57 AM | #3 |
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It almost favors a Porcelain Crab. What do you when you say "dusters"? Below is the description of them I got from Live Aquaria site. If it is one these then its a keeper.
The Porcelain Crab is common throughout the tropical oceans of the world, and has a flat, round body with two large front claws. They are brown and orange in coloration with bright blue spots. These crabs have a pair of front arms called maxillipeds, which have ends that are feather-like in appearance. They use these appendages to filter the water for any passing food. They are peaceful and interesting invertebrates for the marine aquarium.
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Jim Current Tank Info: SCA 150G, 5 inch sand bed, 2 Tunze 6095s, ReefBreeders v2+ 50" with 2 all Blue Reefbrites, and Continuous Water Change System |
11/21/2018, 07:05 AM | #4 |
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Looks like a porcelin crab.
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Adrienne The only thing to fear is fear itself....and spiders. |
11/21/2018, 07:08 AM | #5 |
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If they are constantly waving their feather duster things in front of their face like they are using them to eat from the water column, they are porcelain crabs and pretty much the only reef safe crab and I actually trust them. The colors kind of match the ones on liveaquaria
Mithrax, hermits, all of the reef safe ones are opportunistic and will attack and kill small sleeping fish if given the chance.
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“In wine there is wisdom; in beer there is freedom, in water there is bacteria.” - Benjamin Franklin Current Tank Info: 90 gallon reef. Biocube 29 lionfish tank. Mantis tank. |
11/21/2018, 07:23 AM | #6 |
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This one in particular doesn't seem to be doing the feather duster move. Maybe because it was scared. Most of the ones I still have in the tank do.
Thank you all!! Sent from my SM-N950U using Tapatalk
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[Newbie here so please take my opinions carefully] Current Tank Info: Red Sea Reefer 350 (72G) | Jebao DCT 4000 (1056 GPH Max) | Reef Octopus 152-S | 2 X Jebao PP8 (2100 GPH Max) |
11/21/2018, 09:10 AM | #7 |
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It is always prudent and safe to not trust any crab, there is no such thing as a reef safe crab. They are opportunistic, thus if given the chance........
I had one of these, quite resilient and as it grew acted like a predator. Since going "crab free" over 2 years ago, I have no coral retracts, no missing inhabitants, not even a snail. |
11/21/2018, 09:31 AM | #8 |
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Yeah! I pulled it into QT. Hard to capture these karate kids. Bottle traps did it for some gorilla but these folks seem a bit smarter and I have a ton of them...enough for a good stew probably.
Sent from my SM-N950U using Tapatalk
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[Newbie here so please take my opinions carefully] Current Tank Info: Red Sea Reefer 350 (72G) | Jebao DCT 4000 (1056 GPH Max) | Reef Octopus 152-S | 2 X Jebao PP8 (2100 GPH Max) |
11/21/2018, 09:54 PM | #9 |
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porcelain crab has 3 pairs or legs instead of 4. more like a filter feeder than a scavenger.
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11/23/2018, 08:38 PM | #10 |
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petrolisthes armatus aka Green Porcelain Crab
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