Harlequin shrimp are very easy to take care of. Clean water, a good overhang and/or cave for them to hide in when neccesary, and a steady supply of starfish. I have never seen any I've owned eat anything other than starfish. I've fed linkia, chocolate chips and astrea. I've heard if you get a large population of astrea's (little ones in sumps and on the glass of many established tanks) they can survive on just those. I've fed my old pair a 6" linkia and they would have found it, flipped it, and started eating it within 5 minutes. I used to feed every two weeks when I first had them but I think that was too far apart. I had them for almost 2 years before they died (within a week of each other) but I was fairly new at the game back then and didn't look to see if there was a cause other than maybe starvation. I've felt bad about that ever since.
For the new batch I have 5 chocolate chips in my mantis tank and we cut off a leg every week to feed the shrimp. So in theory one starfish can last a little over a month, but we are trying to give the starfish enough time to regrow their limbs before the next limb harvest. I don't know if that is enough so we may supplement the Harlequin with a full starfish once a month. They can finish off a leg in a matter of a day. Right now mine is in the frag tank and I am concerned my nutrients are getting too high (new algae growth) so I'm looking forward to getting him into the 10gal. But we do have a BK mini 180 coming for the frag tank to help control the nutrients as well as large water changes for now.
Watching a group of the Harlequin shrimps march along through the tank hunting is hilarious. Their cryptic movements and camoflauge make them a beautiful addition to any tank that you don't mind them killing every single starfish in. I tried adding many at once hoping that the shrimp would only take one at a time..... nope, they piled them up and started eating them all.
They can breed in reef aquaria, though it can be very difficult to rear the young through metamorphosis and get them to a juvenile size. just having a successful mating pair is a sign that your providing a stable environment for the critters.
I hope that answered the question!
P.S. thank you Colby for the constant food supply!
Here is my first pair in a 5gal with a single NO T5, and an aquaclear mini filter... that's it. I had them for over two years.
