Actually my nitrates are not bad. They are in the 40ppm range but they do fine with it. Nitrites are 0, max of .5 if they recently ate. I run a Fluval FX5 on the tank with a lot of bio-material and nitrate-absorber, and do bigger water changes. I also change out the filter pads regularly so that waste isn't building up, and run an Aqua-C Remora Pro skimmer. It's just the 2 morays and the 2 lobsters in there, and the 2 lobsters do really well with cleaning up any little tidbits of food the eels leave around. That's why I got them. I also have a bunch of snails, hermit crabs, and a big population of micro-fauna living in the sand and live rock, so everything balances out.

I wouldn't trust the lobsters to not eat fish -- they are very pro-active when it comes to food and will grab at anything that gets close and smells good. The purple ones are fine with fish as they are much more shy and like to hide, but the larger red ones -- no way.

According to the article I read on Maine lobster breeding, they do have a planktonic stage, then a larval stage where they become benthic and sink to the bottom. That would explain why out of say, 500 eggs that she had on her belly, there were only 2 dozen of these guys that made it to the larval stage. I have never seen these critters before, and the tank is 3 years established with no new sand or rock or anything introduced. They just suddenly appeared, 2 weeks after Irma dropped her eggs and they disappeared. Once I caught them and moved them to the breeder net, I haven't seen any more anywhere in the tank. So that's why I don't think they're mysis. Time will tell, I still have them in the net and they're still growing and eating. She has new eggs now, so I'm going to move her to a 10g on her own with very slow filtration and fine sponge covering the intake. That way I can see if the eggs hatch and they really are these little creatures.