Ibogaine breaks down pretty quickly into Noribogaine in your body. Noribogaine can then remain in your system for months afterwards. I actually smoked 5-MEO-DMT 3 days after a particulary brutal Ibogaine flood and I would definitely recommend against it. It's not really that it will take away from the noribogaine as much as it being somewhat dangerous to mix the two. I actually saw quite a few other people do the same thing as me and it is somewhat common down in Mexico, but I think it would be wise to at least wait a month and possibly more because of how slowly the noribogaine takes to be metabolized and the fact that it can make your 5-MEO-DMT trip rather uncomfortable. I would imagine this would also apply to psilocybin but I don't have personal experience with mixing those two. In my experience, it is good to take some time after the Ibogaine to reflect on the lessons it has taught you. I also would recommend some medical supervision or an experienced sitter if you plan on doing a flood and at least an EKG, if not a stress test for your heart. Ibogaine is a very serious medicine and it does have the power to take a life.