The plants will be happiest if they get a variety of ferts. Maxicrop soluble powder (1-0-4) is a great fertilizer for everything- starting seeds, veg, flowering and foliar feed. The dry powder lasts forever and is inexpensive to ship. The Fish Emulsion you have is great stuff, containing all of the micronutes your plants use. Blood (N & Fe), Bone (P & Ca) and Kelp (K & misc micros) meals are great inexpensive, organic ferts to mix in with the soil. Guanos are often high in P and/or N, as well as a number of micros and work well both mixed into the soil or as a tea. Certain types of ash are very high in Potassium and are excellent flowering nutes. It's best to buy them commercially rather than use ash with unknown components. We use palm bunch ash. Ashes are usually very alkaline and need their Ph adjusted before using.
Good Luck