yeah, you're probably right, but honestly, i don't keep track of it at all, i just add salt when I get in new fish, but I don't when I do my weekly water changes....but the salt level is not detectable without a digital device or refractometer.
the catlocarpio siamensis, one of the largest carp family fish, gets to 200 plus pounds, and is rare and delicate!
the second picture is one of the red tail hydrolycus, purportedly the ones that grow real big, unlike the other ones that die around 10" can you see the difference? I had this about one year ago!