I can tell you this get the 55g out of your thoughts, if the shark is healthy it wont be in there for more than 6 months max. I have no clue on the zebra sharks but I would 100% listen to
@Jay Hemdal. I had 2 bamboo sharks I put into a 300g stock tank years ago as babies they were 24" in a little over a year, got them as new borns from a local breeder at the time. 300g and 2 bamboo sharks at 2 years is incredibly dumb, I am not sure what I was thinking. I am grateful for the the breeder helping me. I traded those in for a coral cat shark that was supposed to not get larger than 24-30" and in the time I had it it did not. I had it for the last 3years I was in the hobby before I got out. She was in the 300g the entire time and seemed very happy.