I take it you mean the lince for the tig?
The only problem i can see is the activity of the lince, these cats just dont stop moving, ever. The constant movement of a large catfish could spook your rays and arowana's a bit too much and considering their value i would be hesitant to risk upsetting the tank. There is also the issue of tank size, i know your tank is a good 7 foot long and 32" wide but my brutally honest opinion would be that it just isnt enough room for a lince once its over 18" long, the fish would be constantly crashing into the sides which would be an annoyance to both the fish and the owner.