Hawaiian Red Shrimp Issues and Breeding
I've been keeping H. rubra for about 6 months now and until last month had few, if any, real problems. They haven't bred for me yet, but it is apparently fairly common that they don't start for a year or more. I keep them at 1.019 salinity (RO plus appropriate artificial salt blend), 78 degrees, and there is plenty of algae to eat, supplemented infrequently (every 2 weeks, perhaps) with crushed flake food and spirulina. My nitrogen levels are all zero (tested with salt kit and fresh kit). The tank is fully cycled with an oversized, air powered sponge filter.
Recently the shrimp have started dying. Since they've got a 20 year lifespan, potentially, this was kind of a surprise, as they're supposed to thrive on neglect and instead they're dying in what ought to be a shrimpy paradise. So far I think I've lost a third of my colony of 60 shrimp. They hide a lot, so I find corpses, or pieces of corpses, from time to time. I've done a couple of water changes, but that hasn't helped.
Any suggestions for other avenues to search? The remaining shrimp are still molting occasionally and eating, but 20 shrimp down in a month for a colony that should lose ~3 shrimp per year due to old age is obviously more than a little out of whack.
I don't really want to, but I'm considering tearing the entire thing down and restarting it in a freshly scrubbed tank. The major downside to this will be losing the cycle and the brackish/salt algae that I've got going.
ETA: I'm changing the title of this thread a bit, as it now encompasses both the problems that I was having with them and subsequent breeding information.
Last edited by jasonpatterson; 03-25-2012 at 06:59 PM.