indoor slugs and leafs going purple NEED URGENT HELP.HELP ME PLEASE

MY PLANT was looking beautiful till i flushed with plain water.
i started to get yellow leafs so i decide to flush it with plain water on one feeding then i feed it normal feeding but this made the leafs go purple can any one help me what this could be ?????


i also have found slugs on it this morning NOW I AM WORRIED WHAT CAN I DO HELP ME PLEASE

Whoa... sounds like you got some issues there... first, and this may sound funny, set out a bowl of beer in your grow area. Why you may ask? For some reason, unknown to me, slugs are attracted to the beer. After a day or two you will have a bowl full of nasty beer and slugs... You may wanna try some smaller bowls of beer placed on top of your planting medium, so the slugs can get to it easier.
secondly, the leaf issue... it would really help to have some more info and maybe some pictures. Like, whats your pH? How old is your plant? flower or veg? etc.

hope this helps

Pics.. copper tape on stem for slugs.