Are the plants at a 70 % humidity range and being misted? Often times the mist if done to frequently will rot out the bases of broms and tills. Also is it circulation of the air or outside air being pulled into the tank? Sometimes a fungal spore can cause this too. Good luck!
Tillandsias especially need to dry out. They live on exposed tree branches, and even in many "wet" environments they get soaked and then bake dry in the tropical sun. Many other bromeliads are similar, but differ by having wider leaves and sometimes trapping debris and water in the leaf axils.
@ChocoUniversa, Buy some ammonia and an eyedropper from Walmart and a water test kit for ammonia, nitrites, and nitrates. Figure out (through testing) how many drops it will take to get the ammonia level to the test's maximum measurement. Add that same number of drops every 24 hours. Eventually, the ammonia will start to go down as it's converted to nitrites. Keep adding ammonia. The nitrite levels will spike for a while and then they too will start to go down as they convert to nitrates. These you get rid of by doing water changes, which you should be doing anyway throughout the process. Once all of these are at low levels, your aquarium is ready. It takes about a month, maybe two (mine took a month and a half). Be sure to add ammonia until the day of or the day before you add your axolotl.
Hey guys, this is my first time using this so bear with me. I have an adult axie who looks like he’s developed some fungus on gills. It’s still really small and only on one part. I put him in a 10 gal quarantine tank with an Indian almond leaf. I want to give him a black tea bath but not sure if I can add my black tea to the tank with the Indian almond leaf in there. Any advice?