hmmmmm check out Nicko's flow thread & filter thread. You might think diffrently.
someone probably already said this but..... turn off your equipment before doing the excel kill BBA thing. best to use a syringe and douse offending areas very slowly and limit hand/arm movement.
let it stand for 10 -15 min. Then do WC - add macro ferts- excel & micos - If you do it right ....ut will be all gone in less than 2 weeks. However heed the CO2 warnings - get a drop checker and a good needle valve ( not a clippard - go for a NV-55) GLA sells them.