Coral placement

[ken77]

Ok so the duncans have a stronger sting than I knew. Photo below shows damage to orange cap when turbo snail knocked them over.

If I switch places with the ora green duncans and the rock in the middle containing the sps will the ora duncans and my australian blue duncans sting each other

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[Dtech07]

First I'd move the cap anyways once it starts to grow it will over shadow everything so placing it in corner or someplace low were it won't block other corals out and still have room to grow. I keep mine low to make them stretch up because keeping them high they'll spread left to right more IMHO.
Duncan will live together most the time without issue also you can keep things the sting badly next to other corals if you have good flow to prevents the stinger from reaching or laying on other corals but the two Duncan should be fine together.

 

[Mrfresh]

If u want to do something cool and unique take ur cap and glue it to a magnet and put it higher up on ur back wall.
That way it's out of the way and won't get stung by any thing.
Different Duncan's together are fine.
I do it with my acans and they don't sting each other even at night when there sweepers are out and touching each other.

You could glue the corals down as well. Superglued strong enough to hold the coral in place but not so strong that corals can't be pulled off later and moved.

Good luck and take pics after u move things.