I'm thinking about adding a bichir to my 75 which is currently inhabited by my oscar, severum, rainbow shark and danios. The oscar is roughly 2-3 inches and the severum is around 1-2, while the rainbow shark is 4 inches. The danios were left over from cycling and I don't care about them. My question is how big should I get him? What is there growth rate? And do they eat at night or anytime? Because I had a peacock eel and it would only eat only at night, and even then only a little so I gave him away.