My poor Christmas has been through alot- including being left inside a house when it was "bombed" for fleas!

But it's survived it all, and done decently- until now. It's getting some odd problems with the edges of it's ... er, "leaves". Chunks seem to be drying out and turning a sort of ashy white and crumbly- it looks, once all the dead leaf matter falls out, alot like bug-eaten leaves. I don't think it's a bug of any sort- I'm inclined towards overwatering, but I don't water it often, or alot.

Could it be a result of using old aquarium water on it? I use it on all the plants 1-2 times a month, and water in between as they need it.

My creeping charlie and other plants (of which I have no clue what 4 of them are) seem perfectly fine...