I'm switching up my tank, and it now has 7 clown loaches, and two small angels. I'm going to look for 4 more angels around the same size. I'm hoping for one or two pairs. I'm also going to get a school of cardinal tetras maybe 6 or so. I plan on putting all of them into a 120 gallon thats 4x2x2. Will this be enough to not worry about several pairs of angels? Ans also enough room room to not have to worry about removing the fry?