Great to hear everything is doing well! I love Prayer plants, dunno why, there's just something about them, lol. As for the fertilizer, I'm not too sure, I've never used it so I can't say. Rose and Flower though, on a Calathea, Aloe, and the Fittonia, might be a tad bit too strong, since flower fertilizer is usually high in Potassium and Phosphorus, (Help with roots and budding). For those I'd use the one high in Nitrogen (Maybe a little less on the Aloe and Kalanchoe. Well, I guess you could use a tiny amount of the flower one on the Kalanchoe?) It's all about experimenting too. Use a small amount first, and see how the plants will react! Good Luck and Happy planting!

It was probably over watered in the store and now is suffering by brown roots and droopy leaves. It will take a while for a complete recovery. I rescued one a few months ago and it is very good at telling me when it needs water. Calathea like a lot of humidity and they do not like cold temps, 70 -75 at the very least or they will curl up. It looks like it is thirsty. This can happen if it is under or over watered though. Allow it to absorb the yellowing leaves until they shrivel completely then remove them. You may need to put it on a humidity tray and water it more often. Water when the leaves just begin to droop until about 30% of the water pours out. Do not let it sit in water though. Good luck!

According to the Kohler website the Pinstipe comes in a cross and a lever style so those obviously have different model numbers. The Cross comes in 2 versions, grooved and smooth. The smooth one is called Pinstripe Pure. Each version has a its own model number. Kohler shows that the Pinstripe comes in 3 finishes. The letters after the model number indicate the finish- polished chrome, vibrant polished nickel or brushed satin nickel. The number you gave above is for the shower head and the valve trim together, the 3B in the model number is for the grooved handle. The smooth (Pure) version is is a 3A. The valve trim is also sold separately so it has its own number. The Kohler website notes that the Pinstripe collection has a new version of trim that works with 2 types of valves. The old version that worked with only the one valve is probably what is discontinued "THIS NEW K-TS13134-3B TRIM REPLACES THE EXISTING K-T13134-3B TRIM. THE NEW TRIM IS IDENTICAL AND INCLUDES TRIM ADAPTER KITS FOR BOTH RITE-TEMP K-304/K-2971 HIFLOW AND THE NEW K-8304 SERIES VALVE." The Pinstripe used to come in a gold and bronze finish too so those might be some of the discontinued items you are coming across. Don't forget besides that in addition to the on-off/temperature valve you will need to buy a transfer valve and its trim so that you can operate both the fixed shower head and the handheld at the same time or individually. The valve trim # is K-T13175-3P CP The valves themselves are sold separately from the trim.

Andreea, it might be an infestation. I would remove the affected leaf and, if other leaves start showing the same problem, I'd spray the plant with a solution made of 1:1 water and alcohol, a few drops of neem oil and dish soap.