try using RO or filtered water as well...i see some lime scale buildup (well so i think) on some of the leaves

Nooooooo!!!!! Don't use LA water. Just buy the RO water you get from the machine in front of the supermarkets for this guy. Your water has about 350 to 550 ppm mineral salts as TDS. Very hard on tolumnias. I switched awhile back and everything grows so much better. Just put a cupful on a sheet of glass laying flat and let it evaporate. You'll be amazed water could hold so much TDS and still be clear. Or make ice cubes with it and let them melt in the glass. What do you see in the bottom? Get RO water. That is a nice looking plant. Very healthy looking too.