I agree with both. It is overwatered and nitrogen deficient. You need to start using nutes. (Use 1/4 strength or less for first time!) You also need to let the soil get drier between waterings. Roots need air as well as oxygen. If they are always flooded they will drown. Pick up the pot a couple times a day. You will feel it get lighter as the soil dries out. You want it to feel pretty much empty until you water again. Also, you didn't mention the ph of your water. Make sure you have some way to adjust it to 6.5. Plain white vinegar works if you have no ph down. Do all this and I can assure you that plant will make a speedy recovery.

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