Fishshit/Recharge can are use both at the same time or how long should I wait before I use the other one
Recharge is great for root growth, but also better for the flowering stages. Fishshit is also a simple soil conditioner, but probably better for the vegetative growth stages. Basically both are great soil conditioners and help your plants improve their nutrient uptake.
Honestly unless u overuse it or too much at one time both can be used at the same time. One pretty much should eat the other breaking it down in plant uptake form. Fish shit is good stuff but is super expensive for the amounts u have to use. Have u tried tribus original. Works just as good and goes a bit farther for the price point.