I recently ordered a Red Fin Pickerel from a site for my new tank. The site told me it would be about 8'' and max growth size is 14''. Their site said min tank size 10 gallons....That Sounds WAY too small....So i have a 20 gal that is longer then most normal 20 gallons. I really only plan on keeping the pickerel in there. So does anyone have any tips or any experience with Red Fin Pickerels?