Tanks like yours can take 8 to 12 months to mature naturally so you will get additional rounds of the "uglies" as different organisms and algaes compete and jostle for dominance. Just keep up with manual removals,, avoid the temptation of quick fix chemicals or gadgets. Just be patient and keep it up. Q naturally achieved mature tank will be much more stable and robust in the long run than any artificially achieved stability with gadgets or miracle bottles.
Keeping it simple and patience usually leads to the highest chance of long term success.