The ones I collect are the native golden crinoid, which is a "not too fluffy" star that can be any color from ghost white to brilliant gold. I have only collected ones that I could get into my jar without touching them. Usually when I see one on the underside of the ledge or cave, or at night when they are out feeding, I take my knife blade and use it to seperate the animal from the surface. Once it is in the water column I open my collection jar and allow it to float in and keep it seperate from all other collected animals.
Once home and in the tank, which is natural sea water, so I don't really test the parameters much, I feed nightly on a drip system. I have a 2 gallon jar with an airline ball valve siliconed into the bottom. You can buy them for watering chameleons, but I just made one. In it I put fresh water with the food which consists of baby brine (live and frozen) oyster eggs, DT's, cyclopese, frozen rotifers and frozen cyclops along with H2O's coral vital, I usually mix 3-4 different ones and change it around each night, and after the lights are off I drip this into the filter chamber right at the return pump. I have kept 3 at different times and all have exibited growth of the arms and one got so big in my 40 gallon tank that I had to give it to a friend with a big tank because when it opened to feed it was touching the glass sides of the tank and couldn't fully expand.
I don't have any right now, so I have no photos, but I will get another one and then post both the animal and the feeding station I use.
Hope that was enough because that is all I have for right now.