Watch out, though. In my experience, many blonde Nasos seem healthy but die in 0-4 months mysteriously. I believe (with no data) that they are often cyanide-caught. I went through probably 5-6 before I got the two I have now, which are healthy and growing like weeds.
Nasos are very easy to keep in my experience, so the only reasonable explanation for all the deaths I had, with seemingly healthy Nasos, is the cyanide theory.