Tube worms.

*. Temp---tropical-20 to 28—southern-16 to 24.

*. Conditions---High oxygen levels. Constant current. Plenty of planktonic sized foods. They prefer non-strong light areas. Cool hard water.

*. Negatives—They can start communities within external filter areas. Cause blockages. If they die, they affect PH a great deal.

*. Positives---Low waste output. Eats planktonic parasites. They add visible colour.

*. Food---Filter feeder food. Crushed up flake food or similar. Blended marinara, cunjevoi, dried krill, spirallina and sushi wrap to medium to fine particles, mix in a lot of salt to kill bacteria then freeze for future use.

*. Breeding---All tubeworms release either eggs or sperm and when a release of either is sensed the opposite is released to mix in the current. They will also divide to establish a community, this can happen in you tank quite well if enough food is available. The sand variety breeds via eggs and sperm only.

*. Comments---They can drop their head if need be and grow another. Drop their tube and move. When you get a soft tube variety, remove it’s tube and throw the tube away. Allow protection until it grows a new one. The only way the worm that kills tubeworms can get into your tank is via live rock or an infected tube area. These predators will quickly wipe out your existing and new tubeworms. It will take 1 to 3 months upon release in your tank. Then you have clear out your hole tank and get rid of them.

Feather stars.

*. Temp---tropical-20 to 28-southern-16 to 24.

*. Conditions---Very good water quality over all for long success.

*. Negatives---Affected by ammonia. Low salinity. Low oxygen. Needs good PH and hard water. Large angels, wrasse and some crustaceans will bother them. Need constant food. May attach to and shade some corals. Tend to block exits and over flows.

*. Positives---Very colourful. Eats a little of the tanks parasites. Gives of virtually no waste or pollutants.

*. Comments---Any one in any tank will last a week to 3 months. Any longer and starvation or poor water quality will make them fall apart. These creatures normally feed at night. They feed by catching the fine food in the tips of their features and pass it to the centre then pass it down to the mouth at the base. There can be a parasite or two living on these mainly comasteridae family creatures, like shrimp or worms etc.