There's no room. Trust me I want to do dry ferts. I have more control over what my plants need and get that way. But my wife has pretty much told me no. So I have to go the other route. So I just need to know which is a BETTER product...
oh the joys of women!
I would suggest buying the dry ferts, as well as a big bouquet of flowers to distract her while you hide the ferts up high in a closet somewhere. lol!
Also, flourite is inert. so some root tabs would probably be beneficial.
Flourite doesn't actually have nutrients in it, it is just a clay substrate that has a high CEC which means basically it can take and distribute nutrients to the roots easily, so you would want to use a substrate fertilizer that leeches into the roots of the plants over time.
Flourish and API make root tabs but the cheapest/easiest option are osmocote plus capsules..many tpt users make and sell them on the sell/trade forum. You just stick them in every 5-6 inches near the bottom of the substrate.
Someone else is going to have to chime in on Aquavitro, I'm not getting how it's supposed to work, the ingredients are not what I see in other fertilizers