I currently have a 16" silver arowana in my 135 gallon that is roughly 1 year old. I also have two 5" arowana's in a 58 gallon. my theory is that the bigger one is gradually slowing down in growing and the 5" are about to grow like weeds if I feed them good . Considering the size difference, will there ever be a point where I can house all three together? ( I plan also on getting a way bigger tank like a 300 gal+ by the time I ever did this)