May have made a mistake

[acejock999]

Just purchased the last fish I plan on getting for a while. I bought them from live fish direct. Problem is they seem a lot larger than my previous fish. I'm wondering if they will kill them. I will try to ah pictures later.

I plan on changing my fish foods to NLS next week. I have been feeding basic flake food for first couple weeks but read that NLS is the gold standard. Any thoughts?