In January '04, our club meeting at one LFS scored me this lovely fish. It is an Orange Mandarin. I'd never seen or heard of one this color, but I did have a Green Target Mandarin that might like a mate. This female was chased by the other for months, and I thought they'd never get along, but finally they cruised the 55g each day searching for food. Because of the fish I kept, I also hatched live brine shrimp every 48 hours to assure the Mandarins had live food.
Strombus Grazers are great little herbivores that will breed in your aquarium and/or refugium. They prefer film algae, diatoms, and some turf algae. They may graze on cyanobacteria. These grow to be about 1/2" in length, and are visible nocturnally.
Glass Anemones, or Aiptasia, are a real problem in reef tanks. They spread quietly, and retract quickly when reef keepers attempt to kill them. Using Kalk-paste, they can be injected until they melt away. However, all of the tissue mass must be removed or new aiptasia will return. Removal is best done outside of the tank. Peppermint Shrimp and Copperband Butterflyfish are natural predators, as are Berghia nudibranchs. Do your best to keep these pest anemones out of your tank.
Astrea snails are good for algae control, but you need to rescue them if they fall off the glass and land on their backs. They'll be stuck and could be eaten by fish or hermit crabs. If you don't mind righting some snails as needed, they'll work hard for you.
Copepods are found in predator free zones, and are food for mandarins and wrasses. For seven years, I'd never seen one in my tanks, no matter how many hours I spent studying the sand and rock, day and night. However, one day I noticed tiny white specks on the glass of my son's tank, and there they were! Copepods are part of the food chain, and you can purchase them online and then add them to your refugium where they can breed in safety. More than reef-safe, these are reef-desirable. They eat small planktonic-sized foods, and are part of the food chain that consumes detritus.