Thanks for saying this - I don't know how salifert instructs one to read the ammonia test - but with API - for example - even if its a little 'greenish yellow' - it is still read as '0' ammonia. And even 0.15 does not translate into a toxic level of free ammonia.OK, please note: The color your comparing your ammonia test to, if you notice, actually reads "< 0.15 ppm". That's "less than" 0.15 ppm. So you're not necessarily at 0.15 ppm, you're "less than" 0.15 ppm, which may effectively be zero :)
I really think you're fine to proceed to slowly add some livestock, but if you wanted to confirm, try adding enough ammonium chloride to bring your tank to 1.0-2.0 ppm ammonia, and see where it is in 24 hours. If it's back to that "< 0.15 ppm" I think that's effectively zero.
Let us know what happens!



