if hes adding pirahnas you wanna put them in all at once. new ones added on to the tank later on will be picked on and even killed. if you have to add more you have to go big and ad alit more to slow the picking down.
Thats whats up!!! Congradulations, I know how exciting it is to stock a newly setup aquarium. Im in the process of thinking about what else im gonna put in my 180 g with stingrays!!! Can we get a full tank shot? And how big are they?