90 gallon build..need help please

[Myka]

Sounds good! When both ammonia and nitrite have been 0 for a week straight and nitrate is below 10 ppm you can add a small clean up crew. Maybe half a dozen Astrea or Trochus and half a dozen Cerith or Nassarius? Personally, I'm not a big fan of hermits since they are predatory. If you do want to add some, just add a few. Scarlets seem to be the lesser of the evils.