dont get me wrong, my cloves are awesome, and look great. they just grow at a snails pace.
IME, there are at least 2 different kinds of cloves out there, and i'm not talking about color. the kind of clove that seems to be coming into the market now, has relatively small polyps (around 1/2 inch), coming in on very large colonies for very cheap prices. everyone i know who has this kind, they grow pretty quickly.
the kind i have, has HUGE polyps, some close to 1.5inches, and look more "feathery" looking. everyone i know that has this kind, they grow soooooo slow.
its hard to describe the difference i'm talking about, so you'll just have to take my word for it
also, with mine, and the frags ive given to people, they never seem to put out runners horizontally along the rock (like a zoa would spread out horizontally over a flat rock), they always send runners going up vertically along a rock face near the colony.
also, the only times they put out new runners and polyps, is when i make a drastic change to the tank. i.e. they put out 5 new polyps when i added carbon one time, but then stopped a couple weeks later. they put out a bunch of runners and polyps when i added a different skimmer, and when i changed the lighting, AND when i moved them to another tank.
so for me, they seem to only respond to big changes to the tank, but them abruptly stop growing a couple weeks afterwards.