My son's 55 gallon stock can be seen in my signature. Recently he's wanted to add Black Phantom Tetras to that stocking, does anyone see a problem with the addition of at least 6 or 8 Black Phantoms? It just so happens that Petco is having a sale on these at $1.25 or so each according to their website. I've always loved these fish & would like to see a slightly larger Tetra in his tank. Any compatibility problems? Thanks in advance to all that reply....................