I have a 26 gallon bow front tank with 2 baby Oscars, Red and Piglet. Yes I know they will need a bigger tank later so please don't reply and tell me that.

Temp and water are good.
First, I had a Pleco for 5 days... died for some reason... no signs of stress. the only thing he started to do was swim to the top of the tank and let out a few air bubbles. He did that for a day and then was a floater. No visible signs of anything and I never really saw the Oscars mess with them.
Second, the Oscars hide when we come in the room but I have read that they will stop that at some point. I am going to get a blue light or dinner one today.
Third and main reason for post, they have started swimming all over the tank. Up and down the walls repeatedly. I think I may be a little gun shy since I just lost my Pleco. I want to make sure tey are ok... they look fine but so did the Pleco.
I have had Oscars before but they were huge and very slow to move around until the feeder fish dropped in! Not use to all this activity. Just want to make sure they are ok.