Hi Dave, I suppose they are moderatly hard to keep. They aren't too fussy about water conditions, light, flow etc. Although they tend to be found in shaded areas on the reef. Mine was up right near the halides and was fine.
They do need fed very regularly. Mine was fed cyclopies when it was smaller, then moved up to mysis, every night. It doesnt have to be every night though. Another very good food for it is blitzed halibut. Just go to your local supermarket and get some halibut then stick it in a food blender and you can put it in a ice cube block and then freeze it. Very rich food.
Yes it is normal. The polyps will fill out the more its fed, they can grow quite large. They reproduce by both spreading or releasing little ones which attach where ever they land.
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8' x 2' x 2' - Piece of Ocean.
6' x 2' x 18" - Wild Caught Zaire 'Moba' Frontosa 
4' x 2' x 20" - Malawi
4' x 22" x 18" - Malawi + Victoria
4' x 18" x 18" - Breeding Cuban Cichlids.
Trigon 190 - Paratilapia Polleni
30" x 1' x 1' - Hospital Tank
2' x 1' x 1' - Tropical
and
7x - 1' and 2' cichlid fry tanks
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