Would 4" Columbian Shark Catfish Be Safe With Smaller Fish?

[Doomchibi]

My plan is to keep 3 baby columbian shark catfish in my 55g brackish tank until the sharks are a bit under 4", after which I would be moving them to a much larger tank with some monos and scats so they can eventually be converted to marine as they all grow.
 
My reason for keeping them in the 55g first is that I want to raise the salinity over time, starting at about 1.005 sg and increasing it to 1.010 until they reach 4".
 
What I would like to do is keep them in the 55 along with some orange chromides, a 7" dragon goby and a few mollies, so when the sharks are moved I can continue on with my plan to keep bumblebee gobies and desert gobies in the 55g with my other stock after the salinity is brought back down to about 1.006-1.008. 
 
My main question is would adult mollies and 2-3" orange chromides be safe with the young sharks?
 
Any help would be appreciated, thank you.

 

[iliveinazoo]

If you are moving them on at 4" then they should be fine but catfishes generally have large mouths and once they are approaching 1 1\2 times the size of the others then the risk will increase.

 

[Doomchibi]

Would the sharks start biting at the other fish as they were growing, before they could actually eat them, or am I more likely to suddenly be missing fish with no warning?

 

[iliveinazoo]

I've never kept them so can't say really I just know that they will prey on smaller fish

 

[Doomchibi]

Well, i've got 2 now since they were the last the store I went to had, and i'm going to go out for the 3rd as soon as I find another. I also got 2 mollies and i'm going to be watching all of them to make sure no one is being bullied, and i'll probably end up moving the mollies out when the sharks get to about 3" just to be on the safe side. The store was feeding the sharks flakes only, and it seems like they were literally starving.. I've never seen them so skinny! They both seemed weak but since I've gotten them both to eat some mysis and bloodworms they have gotten much more active. Right now they are in a freshwater tank, how many days of rest should I give them before I start drip acclimating them into my brackish? I didn't want to shock them by having to go through both transport and different water on the same day.