Burn?

I haven't had plants in quite some years, anyway I received this as a gift for summer unfortunately she looks to be flowering already, maybe it will revert maybe it won't but looks like I am having some issue couldn't really figure it out from the stickies. Happening to middle leaves and very bottom ones. Let me know what you guys think.

Dark green leaves with leaf tip death usually indicates over fert. how much fert has been given each time and how often is this being done? What potting soil is that? The pot looks too small for a plant that size which will only keep growing.

You have a potassium deficiency and a magnesium deficiency caused by high nutrients from the nutrient tip burn. The edges burn from the potassium and the bottom yellow hue is from mag. I wouldnt feed them if you are