Hi, i have been groving pineapples planted from suckers. Two of three have been growing fine, but now are developing brovn soft areas on the middle of the leaves, but not at the tip or the base. They were planted in potting soil with some ceramsite on the bottom of the pot for drainage. I water them them when the soil gets dry. Two weeks ago i started watering them with added fluid hoseplant fertilyser. I add the fertilizer according to yhe instructions. They are places next to a window facing east-south side. I don't see any mealy bugs ar any other pests. Maybe I over water them?