I first got my tiger oscar in late January beginning of February I believe he was about an inch when I got him or her I first had him in a 150 for a week or so and it sprung a leak and I had to do an emergency move at 1 in the morning and all I had was a 20 gallon to put him in unfortunately, he was in there for a few months or so and I bought a 75 gallon which he or she was in for about 3 months then just recently I moved him to a 135 gallon to get to the point he or she is only like 5 maybe 6 inches long and I remember the oscar I had before grew alot quicker I'm scared that it's growth is stunted but I'm not sure and hoping that it goes threw a growth spurt and hits 10 to 12 inches one day any input will help and yes I know 20 gallon tank is to small I had no other options but now my o is in a big tank