Angel fish

It depends on a few factors Rhys. Tempature, water quality, and food. A tempature in the higher range will cause them to grow faster, given they have excellent water and are fed high protein foods. They grow fairly quickly, 4-5 months till they are mature, and thats fairly conservative. If things are highly maintained and they are fed high quality food, they should probably be adult size in about 6-8 months. I have limited experience with Angels, so I'm going on what I've observed with them.