I just use diluted seasol (liquid seaweed fertiliser) and silica for my hydro vase water. The seasol is usually diluted down to around 5-10%, so 1ml into 9L of water instead of 20ml
General hydroponics 3 part flora series, dynagro foliage pro or grow, gt foliage focus would be good houseplant options. Hydroguard is another popular additive to break down organic matter in hydro setups.