Found Velvet Nudibranches at last!!!

[casey]

Just received my shipment of 6 velvet nudibranches to hopefully attack the planeria which has taken over my 75 gal tank. Are nudibranches nocturnal? They aren't moving around too much. I took a long time acclimating them to the tank. I know they're really sensitive so I'm holding my breath that they survive.
Do they have any predators in a reef tank, such as emerald crabs or certain fish?
Anyway, I have high hopes for their clean up job. Let's keep our fingers crossed.
Casey

 

[casey]

With the amount of planeria I have in my tank, it will take a long time for the nudibranches to starve. Will they only eat live planeria? I can't tell how much of the planeria is alive - do they die off in a day or 2? I can't see the flat worms move but they cover the live rock in my tank, especially around the substrate.
Thanks for any advice.
Casey

 

[casey]

Anyone know if they're nocturnal? And what about crab bothering the nudibranches?
Need some info.
Thanks