spiny

Hi I am new to the site but have a nice 75 gallon setup with some baby monster fish. It has a glass bottom with rocks and lots of places to hide and my fish so far are, 2 rope fish, 2 fire eels, one goby dragon, a zig zag eel, a clown knife fish, a peacock eel, a spiny eel, a dinosaur bichir 7...

Im trying to figure out what spiny to get for my 125. The tank is fully planted, with about 3" of a sand/soil mix, has lots of natural leaf litter and rockwork. The main inhabitants of the tank are some Bala Sharks all around 5-7" right now and an 8" kissing gourami, along with a dozen or so...