At first glance having grown both fishTAIL , and foxTAIL, palms indoors years back , i think perhaps you misspoke in your identification of the ones you have, which look more like the fishtail variety , but on to the problem ' yellowing' of fronds , most often if there seem to be small webs associated , it's likely a case of spider mites which can really yellow and kill fronds in the worst infestations , but also a common nutritional problem which could be a lack of enough magnesium or in some cases iron for some varieties , but can't recall the Mn or manganese being mentioned , though it may be slipping my mind .

Talk about petulant corporations...I used to pay for Photobucket. Since I stopped..they now block- and Im sure all former users- from seeing any photobucket pictures. Not just their own. All photobucket photos.

Stupid and for sure I would never use them again just because of that.