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If I remember correctly its about a year. I had some that where 2 inch grow to 5 plus inches in around six months. Mine are still growing so Im just going by my discus book
Discus stop should be 5-6" by within a 9-12 months depending on strain, some have slightly higher or lower growth rates depending on fish and genetics.
Well mine are between 2 1/2 and 3 1/2" I feed them the nls you told me to get. Finally all of them eat it. Found out they like it once it hit the ground. Although one of them spits it out alot as well. I guess he is still way picky