Yes. I was thinking the same exact thing. I was wondering if that even was a dempsey since it looked much different and it stayed black all the time! I was told that dempseys change color from white to black depending on if they are scared or not?(Im not sure).
I am not used to all these new fish names but what is a Pacu?
I plan on getting a Plecto because I know it helps alot with algae problems.
The fish store that I went to, It was a Petland Discounts, if anyone knows what that is and the people there seemed to know a little. When I asked for three Dempseys, they gave me three other fish that were black and white. I asked are you sure those are dempseys? because they charged me double the price I was supposed to pay for. So they dumped them all back in, and I told them firmly: I Want Three Jack Dempseys. So the guy is like okay and they gave it to me.
Now I've figured out its not a dempsey. Because one fish keeps poking it.

I think its gunna die soon anyways because it keeps laying down on the gravel.

I have a feeling the jack dempseys will eat it soon. But right now, they aren't eating anything.
Also, should I add in natural plants? They look nice and I think they would offer cover the fish but are there any special requirements?
I am having a bit of trouble with my heater where it gets my tank up to about 70 fahrenheit. Is that okay with Jack dempseys? I got the heater with a starter set and its only for 10 gallons it says.
Any other fish I can add? Thanks everyone for your advice.
