Don't add more fish unless you want more fish. You need to get a half pound or more of KNO3 and you need to get a lot of flourish and flourish Iron or something else of the sort. I would also get some fleet enema. Dose your tank according to the estimative index and things should work themselves out. Keep doing waterchanged in the meanwhile to get things in a good ratio. the plant spikes would have eventually run out of nutrients so i think it was a little rash to take them all out.