I agree with John--catt seedlings will often appreciate much lower light. East may be perfect for mid-range seedlings, or those that have "taken off" so to speak, but might be too strong for the younger seedlings. Moving them back a foot or two won't hurt, IMO.

Catt seedlings that have a sparse or shallow root system pose another problem. The top of the media where the roots are may literally dry out every day. For these plants (and I have a walkeriana backbulb in this category right now), I like to water with the rest of the plants of that pot size, and then mist heavily every day. It seems to me that if you water too much into the pot, the media will just break down sooner, when the roots start to grow down into the interior of the pot, they'll find an environment that is much too wet and anoxic for their tastes.

Red pseudobulbs & root tips aren't necessarily a bad thing. These anthocyanins are produced to protect plants from the sun (so I've heard), and indicate that the plant is getting good light. For the handful of catts that I have, I like to see some red pigmentation, because those that produce the pigment will likely not bloom if the light levels are not sufficient for them to produce it.