Did you ever get a microscope?How much of this did you dose and what size of tank and sump?
If not its the only way to fix the issue. You've been dealing with this for months now so i can only assume your tank looks terrible. IMO if you kinda see signs of dinos you need to act quickly and start treating.
@BetterJake is giving you great solutions especially the FB page. How i solved mine in 45 days.