Many of my cattleyas have red on the leaves and, as long as the leaves don't burn, I don't worry about it. You said you use a bloom booster fertilizer. I would recommend that you not use a bloom booster during the spring and summer. The high phosphorous can block other nutrients from being absorbed. I would recommend Southern Ag 16-3-16 6 Ca 3 Mg from Broward Orchid Supply in Hollywood, FL, or Norman's Optimal Orchid Nutrients mixed with MagiCal cal/mag supplement. You can get both those products from Green Barn Orchid Supply in Delray Beach. I recommend that you buy the book Florida Orchid Growing by Dr. Martin Motes. It's very specific to growing in Florida. Also there are many great orchid societies in this area. I belong to the Ft. Lauderdale Orchid Society and the Plantation Orchid Society. There are other societies in Sunrise, Davie, Pompano Beach, Margate and on and on.
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