unknown; identification; help

Hello, I’m new to TFF, which I’ve been relying on for some problems I’ve had in the past. I’m sorry to say that I come with a problem that I desperately need an answer to, I’ve been freaking out!! I’m still new to this hobby, so please have mercy. Just yesterday morning I came home to find my...

BACKGROUND I have a 20 gallon long with neocardina shrimp, two hillstream loaches, and one nerite snail (which disappeared). I left home for about 40 days, placed an automatic feeder on the tank and had my neighbor check on them. I came back to a crazy amount of black algae on all my plants...

We recently started a tank and went to our local pet store to buy 6 scissortail rasboras.... however when we got home we had 5 scissortail rasbora and this guy... the only other fish in the tank were hatchetfish and he looks nothing like them. Any ideas? I don't want to take the poor guy back...