Hi, I've got tired of my tall growing E.Quadricostatus. They are about 15-20cm tall, some taller than my E.Amazonicus. I need it to grow less than 10cm. I saw the same thing at the fish shop and their runners are less than 5cm tall. It must be the CO2 as the shop do not inject any CO2. Someone please advise me how make it grow shorter. Don't tell me to use E.Tennellus because the shop are not selling them over here. Thanks. rgds..kbkoh