How to grow my redtail sharks beyond their max lenght of 6 inches

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I have two 6 inch long redtail sharks. Apparently that is their max size. I there any way/thing to make them grow larger then usual?

You could feed them more, put them in a tank about three times their recommended tank size, and keep the water quality pristine. Those are what I can think of off the top of my head, but these are just things I've heard, I don't know if these are proven to work so take them with a grain of salt.
 
You could feed them more, put them in a tank about three times their recommended tank size, and keep the water quality pristine. Those are what I can think of off the top of my head, but these are just things I've heard, I don't know if these are proven to work so take them with a grain of salt.
Thank you for providing the information! I just created my account today and wasn't expecting any answer.. I currently have them both in a 90 gallon. It's well planted, water stays relatively clean, they are feed flakes, bloodworms, and shrimp. Only one other fish is in with them, which is a 7 inch Bullhead catfish. I intend on removing the Bullhead when my new tank arrives, so they'll have 90 gallons to themselves.
 
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Although the red tail black shark remains small.
There are other Labeo species that get much larger.
The Labeo chrysophakadion (black shark minnow) from the Mekong Delta that can reach over 3 ft in length.
I had seen some in the Saigon fish market years ago at least that size.
Of course beyond feeding, a rigorous water change schedule is also required to get them to grow like that, to keep growtth inhibitores like nitrate low.
 
Although the red tail black shark remains small.
There are other Labeo species that get much larger.
The Labeo chrysophakadion (black shark minnow) from the Mekong Delta that can reach over 3 ft in length.
I had seen some in the Saigon fish market years ago at least that size.
Of course beyond feeding, a rigorous water change schedule is also required to get them to grow like that, to keep growtth inhibitores like nitrate low.
I saw many Chrysophakadion for sale when I went to Japan. I just can't figure out how to get one here to Georgia.
 
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