If the underside/foot has orange dots and slashes then it is a mini-maxi or maxi-mini (S. tapetum). If there are no markings, it could be a small S. haddoni, but it is hard to tell at this point.
3 baby red haddoni
Additionally, and I'm surprised no one pointed this out, haddonis are sand anemones. I have never seen one (of any size/age) that would stay on a rock when a sand bed was present.
I don't think any of these anemones are haddonis, personally. They just don't look like it to me. But who knows? Maybe I'm wrong?
I do agree that they are sand dwellers, however I have notice that many small haddoni tend to prefer rockwork. Certainly true in the case of the two smallones (4") I've had in the past. Both found the rockwork and disappeared never to be seen again:hmm6:
Perhaps they need to anchor their foot and if the sand is to deep they move to the rockwork. Would make sense for small anemones to attach to something thats not going to be easily disturbed.
Despite regular feeding mine hasn't really grown much, if at all, either. Still nice though !
if these reproduce asexually, i would actually prefer to have these than baby haddonis. I think they look cool, and haddonis just get too big for me.
I'm 99.9% certain they're not baby haddoni. I bought one from my LFS and they had SIX in stock. As bonsainut has pointed out, to find one would be a lucky baby haddoni find. But to find six + of the same colour morph (presumably in the same relative location) I would imagine is just about impossible. Despite regular feeding mine hasn't really grown much, if at all, either. Still nice though !
If the underside/foot has orange dots and slashes then it is a mini-maxi or maxi-mini (S. tapetum). If there are no markings, it could be a small S. haddoni, but it is hard to tell at this point.
How much did you pay for them?