Uh oh Lynden....I am back!!!! Just kidding bud - how's it going?
Here is what I know from experience and from others (sorry if I am repeating anything....only doing so because I agree
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Again mythrax being emerald crabs?
An emerald crab's true common name is the "Emerald Mythrax Crab" in most circles. These crabs are omnivores and opportunistic eaters --- meaning you need to make sure they have enough algae to eat or they could harm corals and possibly some beneficial hitchhikers (usually not a problem, but I know a couple people who just figured that out the hard way)
Will the juveniles eat crabs and snails?
My understanding is that the hermit crab/snail threat is if they do not have anything else to eat OR do not have a larger shell to move into when they need it....so small hermits can become problematic too. Otherwise I do agree, larger hermit crabs are probably best off in a snail-less tank or in someone else's tank (I am still trying to catch some of the 50 hermits I bought when I first started....and can only keep small snails alive right now)
I was looking at these fish online. A few sites told me they've been deemed very unlikely to survive in captivity. It's because of malnutrition. Since they eat parasites they can die if there's no parasites in your water. Would the eating test still work if I got one? I've heard they also eat mysis/brine shrimp too.
I think that tide is starting to shift a little bit nowadays - it is getting easier to find cleaner wrasses that will eat prepared foods, but the ethical debate is starting to focus on the fact that they are needed in nature and without them other fish populations begin to suffer. Case in point:
Yea...double standard on my part. I have had two of them for about three/four months now and they are still cleaning my fish and eating mysis shrimp. In my defense, at the time of purchase I thought I had to buy them because they ate prepared foods...without knowing that I was still wrong to do so.
Dwarf Lion: Actually these fish can be kept, usually, with anything past half it's length (if well fed; it would be safest to keep them with things longer than them). It probably will eat the mythrax crabs, however.
I don't really disagree with this per say, but two things: 1) It probably depends on the type of dwarf lion you are looking at and 2) Finding one that eats prepared foods will be less likely to eat an emerald mythrax crab (I will stick to emerald crab...less typing) or other live fish
For example, the Fu Manchu lionfish (I believe the smallest of the bunch...or close to it) probably doesn't pose a threat to any fish larger than two inches and probably couldn't inhale most any emerald crab I have ever seen in an LFS so far. And I do have one right now in my tank that holds 6 emerald crabs. I also have a fuzzy dwarf lion who hasn't eaten any live fish or emerald crabs yet. Like I said though....I don't disagree with the fact that the threat exists, only trying to point out how to reduce that threat. Here is my fuzzy dwarf eating mysis shrimp - my Fu Manchu is highly nocturnal so I haven't gotten a vid of it eating yet (not one that is good anyways)
(He is quick so watch carefully)
About the Mandirins and Scooter Blennies: I know they both take frozen mysis shrimp though. My cousin has a huge reef set-up with both fish and they've lasted forever. So is it luck? Or do you have to entice them to eat frozen foods?
I agree with the fact that they will eat frozen foods....all of mine have. I know that a lot of people have been having some decent success with breeding mandarins (not sure about the scooter blenny though) so if you can get a hold of a tank raised version, you probably would have some better odds at keeping them long term. However, your cousin probably has more than luck on his/her side - namely the "huge reef" that is probably teeming with copepods (which is why Ski probably mentioned the 75 gallon minimum like he did). Here is proof that they will eat for the many naysayers out there...
Almost never eat fish, will likely eat the mythrax crabs.
Of course, I have to disagree with something Lynden says or I wouldn't be Tommy Gun...I had a snowflake eel who refused to eat anything but live feeder fish for the longest time, but I was pretty successful with garlic-laced krill. Anyways, I realize that Lynden is right for the most part, but the overwhelming theme here is that you are probably much better off taking each fish/eel you find in the LFS on a case by case basis. For example, if you just buy a cleaner wrasse it might not eat prepared food and die in a couple weeks, but if you buy one after the LFS shows you it will eat, your odds increase. Same thing with the eels....they definitely have the ability to eat fish, and live ones to boot - which is a silly thing to do for most of these people, but any LFS employee could be just as silly (not my vids):
<a href="http/www.youtube.com/watch?v=CtH35aXxZkc" target="_blank">http/www.youtube.com/watch?v=CtH35aXxZkc</a>
<a href="http/www.youtube.com/watch?v=kkO9lLE5rBs&feature=related" target="_blank">http/www.youtube.com/watch?v=kkO9lLE5rBs...feature=related
</a>
<a href="http/www.youtube.com/watch?v=-DgbMBEfwCQ&feature=related" target="_blank">http/www.youtube.com/watch?v=-DgbMBEfwCQ...feature=related</a>
(Lynden! A trigger eating live fish? I never even heard of that one (honestly)....is it normal?)
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The mythrax crabs meaning the emerald crabs? Is there anything else that's compatible with these fish that eats algae and/or is a scavenger?
Just thought of something....urchins! I just picked up a long spine urchin the other day (because my snail population is shrinking daily) after reading about them being fantastic for algae in pred tanks that wouldn't allow for other clean up crew members. They are venomous as well I guess....but so are the lions and you probably wouldn't want to get bit by a snowflake eel either so I think an urchin would be the least of your worries. Anyways, just an idea.