So I rescued this betta from Facebook a few months ago. He was in a small tank and looked sick. He has grown into a healthy looking boy. I have him in a 3 gallon tank as that’s all I could find at the time. I have this 25gallon tank setup it’s been running for a few months with a filter and heater but there’s been a bunch al algea in it and I have had to do a lot of cleaning. I want to move my little boy from his 3 gallon tank to the 25 gallon tank but I don’t know how to go about it. The 25g tank has 0ammonia 0nitrite 0nitrate. Would it still be considered a fish in cycle if I move his current filter and decorations into the big tank with him? I added his before picture.