Good deep conditioner for color treated hair?

If you're only bleached this probably won't effect you but using a protein conditioner can fade your color. Something about the larger molecules pushing out the color molecules ... I'm not a professional. This is just something I read and then confirmed with my hairdresser. I have blonde hair too -- bleached and toned. I try to stay away from the protein conditioners for at least a few weeks, just because I want to hold on to my toned color for as long as I can. That said, I like:

Kerastase A LOT (the "orange" line AND the "green" line/the Masks

L'Anza -- Leave-In protector; LOVE it. (It's one of the few things I've bought more than once) I mix it with Sheer Blonde Spotlight.

Joico K-Pac is good too -- the deep conditioner; and it smells delicious -- I hate to say it but I think that's the biggest part of the draw for me.

I also use all kinds of other stuff -- drugstore and salon. Those are my faves.

Sackpac,

I recently started using Mane n' Tail shampoo/conditioner based on some awesome reviews that I've read about it (it was originally designed for horeses' manes, but is safe for human use).  I alternate every other day between the Mane n' Tail and my regular shampoo/conditioner, and I have to say that I sometimes cheat and do the Mane n' Tail  a couple of days in a row because it makes my hair look and feel so soft and silky!  My hair is foiled blonde also and I haven't noticed any problems with fading, but I do use a blonde brightening shampoo on my alternating days, so I don't know what would happen if you were to use it every day.