Is this normal suncoral family?

[beosakti]

Dear Reefers,

Is this normal sun polyps?

I have another sun polyps that open up perfectly at night.
But this one, already 2 days in my tank and not yet open.

 

[stunreefer]

That appears to be a species of Tubastrea, but could also be a species of Dendrophyllia. Regardless sometimes both take time to open in captivity, see here: http://www.reefcentral.com/forums/showthread.php?t=1719839

 

[uhuru]

That's a nice sized colony!

 

[Titeo]

that's normal suncorals try to put some cylopese near them.

 

[stunreefer]

that's normal suncorals try to put some cylopese near them.

Why are you so sure? What do you consider "normal" "suncoral"?

"Sun coral" is just a common name, there are at least 9 recognized species of Tubastrea, and 33 recognized species of Dendrophyllia, some of which are barely distinguishable from one another, especially just by a picture.

For example, these are both species of Dendrophyllia robusta that I bet 99% of hobbyists would characterize as "sun coral":

Based on the growth pattern and coloration of the colony on the right side of the original posters picture I would venture to say that it's Tubastrea faulkneri (encrusting/balling formation), but the other is harder to be certain, likely some species of Tubastrea, but for sure... no.

Regardless you can follow the same care provided in that link, just pointing out that there is no "normal" "sun coral" and these two generas are not so easily distinguishable as most think. Our best bet in the hobby for the most part is price, unless it's an obvious species of one or the other (for example Dendrophyllia fistula is what most people think of when they see a "dendro" in the hobby).