When attaching SPS frag to LR in underwater...

[7thheaven]

Which one is better?
1.

and I am using this one...but it is not easy to attach it...

2.

How about small colony? zap gel is good to do it?

I have never used #1 product...

[fkadir]

Assuming dat the epoxy youare using is capble of curing underwater :

The gel is perfect for frags dunt generally do not have the holding power for larger colonies. I genereally gel it down first and then use epoxy for extra holding capability. When using epoxy for larger colonies, you have to hold down the colony very steadily till the epoxy hardens which usually occers in a couple of minutes. HTH

[tonkadawg]

I have used similar products - both gel/super glue and epoxy. I think it is easier to use the epoxy and I get better results. But like Farish said, make sure the epoxy is capable of curing under water.