The lima will get to 18 inches and grow extemely fast. I have heard up to 2 inches a month. If you buy one at 3 inches, then you should be able to add him right away. The clown loach needs a new home immediately. The loach will be food for the lima when the lima reaches 5-6 inches.muckieman;1476609; said:how long does it take for them to get to a good size because i have a silver aro 4.5", 3 p bass 2-3.5", and a clown loach 4.5".