mixing

If I mixed a faded Red Texas with a Water Kok flowerhorn could I get a Red Texas with a fairly large kok and a flowerhorn body shape while still keeping the pearls and the red color?

I use a semi-large plastic tub for mixing saltwater, and I made a batch a couple of days ago. I realized that after leaving it out for a day the inside of the container starts to smell really strongly like a cleaning chemical or burning plastic. Is this the wrong material? Should I stop using...