Arow will grow much faster and when that front can fit in his mouth, its probably going to be an expensive meal. They grow 12+ inches but slowly I ve had mine for 2 years and its only 6-7inches from 1 inch when I first got him. The arow will outgrow a front easily in a month or two. As for the front and the 10gal I wouldnt suggest it either although it may be small that tank could easily stunt it or make it grow much slower. Just from personaly experience they seem to grow by how much space they have the more space I gave mine the more he grew, the other one had less space and is growing much slower. ANyways good luck!