+1That is a lot of fish for such a small tank, cant see how the water could be good with a 50% every 3 or 4 day. Even daily changes of 50% are probably not enough. While the bigger tank will be better you are still going into it way overstocked. I would seriously rehome some of the ultra large growing monsters since housing them will be the most difficult. A mbu will need a huge tank and so will a royal clown knife just as an example.