If you are using it as part of your regular feeding, then you probably do not need an additional wetting agent.
Detergents are chemicals that bind/trap/absorb other particles for cleaning. Surfactants are chemicals that reduce the surface tension of water.
Detergents also have surfactant properties. I.e., all detergents are surfactants. Not all surfactants are detergents.
For grow applications, when we need a wetting agent, we normally look for nonionic surfactants that do not provide plant nutrients or otherwise affect overall plant nutrient balances. Detergents are usually ionic or pH-based and can impact nutrient balances. However, if you are using a detergent for other reasons and incorporating it into your normal feed, it will also function as a wetting agent to a degree.