a 125 will work fine for growing out the group and for being the permanent home for the pair you end up keeping, GOOD LUCK!! i love midas! definitely the fish i regret the most getting rid of (followed by my festae and carpintis vontehillo haha)
i would try and hold out for the CL deal, especially if your in Tampa you should have no problem finding a great deal on there, you will save hundreds! haha after seeing some of the deals that have popped up on my CL randomly i really would not buy a tank new from the store again unless it was some type of custom fit or something...
ok muscle for me i have always had lots of midas i will post some pics real soon of what i have but i have and i still do randomly throw pairs to gether and they get along fine i have a yellow female and a creamsickel red orange and white male together that i put in the tank together and they spawned two days later an still with the fry two in a half months later but im about to remove them cause they r eating their parents lol