Who Gives A Fish Forums

Alder cones are great, but go easy—they can drop the pH fast if you overdo it. My 20-gallon's got two cones, and that's plenty for the effect.

Have you tried oak leaves? They're similar to Indian almond leaves and usually free if you can find untreated ones. Just boil 'em first to sterilize. My 20-gallon's been running on oak leaves for months, and the tetras are chill with it.