i have recently got rid of my wyckii, he was a lovely fish but a bit boring. i have now been offered an 8" channa micropeltis, my tank is 7ft x 2.5ft high x 18 inches wide. how long will he be ok in my tank for as i have just recently moved house and i am getting round to having a 20ft x 18ft shed built with a tropical pond inside. any advice welcome and thanks in advance.