What evil said. xD
They will gnerally have the VT tail shape with slight web reduction, or combing, in the fins. There can be alot of variation.some will have very little and some will have almost CT quality web reduction.
My current spawn is a CT male and assumed to be VT or RT female with combtail features. I'mhoping for alot of web reduction in a couple of them to breed back towards full ct, then better that by working on the spreak to getting it to be 180 hm type spread. <3 lots of work ahead of me for my blue babies xD