Originally Posted by sealife
So does this mean they can stay small in small tanks? I have no idea what kind of water changezs he does. But he once told me the standard water change for a healthy tank is 10% every 2 weeks. The Red Devil was about 17 to 20 cm big in the 20g tank.
Is this for real? Please don't listen to anything this guy is telling you. 10% every 2 weeks isn't a good water change schedule for 99% of tanks. Only the occasional heavy planted under stocked tank is going to survive this way. 50% a week is healthy on an average setup. If you have heavy bio load fish, do more. It depends on how much bio load in the tank and how fast nitrates are building up.
I have one for you.. a guy once told me you can keep an inch of fish per gallon of water. So I keep my 10 inch fish in 10 gallon tanks now. With of course 10% water change every 2 weeks. But they won't grow any bigger because they know they are in 10 gallons so they can only grow 10 inches. Don't want them to out grow their tanks.