Use whatever fertilizer you prefer. Auto flowering strains are made by cross breeding indica and/or sativa with ruderalis. The hormones of the plants automatically switch over sometimes as quickly as 2 weeks into vegging so make sure you provide whatever bloom fertilizer you're using around that time. Consult the breeder and ask them when it switches into flowering.
I've had decent grows with miracle grow but it leaves much to be desired. The important things are that it's getting N, P, K, small amounts of Mg, and Iron as well as the usual trace elements. You can get that from compost tea or you can get it from ammonium nitrate. Whatever you use, do your research and see how much your fertilizer provides and when you should provide what to your plants. There are loads of guides out there for it and ruderalis to my knowledge has no extra special requirements.