What tanks do you have and what shrimp all together? lol. basically no neocardinas with any other neocardinas and no cardinas with no cardinas.
Yellows, reds, pearls, rilis are all neos and will crossbreed like bunnies and go back to wild colors and ruin any colors.
Tigers and crystals are cardina and will crossbreed but not as readily as neo's. I know lots of people that have kept OEBT's in their crystal tanks and never had a tibee. Most figure the tibee's and back crossing with other crystals, tigers, goldens, is where pandas/king kongs/wine reds/blue bolts come from, but no one really says exactly how they made them originally. From most reading online, most people who get a tibee force the situation by putting on a crystal female and a bunch of tiger males together and sooner or later they will do the deed, but in a mixed tank with both, they seem to stick to their own kind. I'm in the process of setting up a 20gal for my crystals and tigers. If I get any tibees I'll put them out, but I doubt I will really. 14 tigers, about 30 crystals, they will probably stick to their own.