Nice-
Acouple things though-
Get a background on there-Painted looks best.
The gravel would be nice if changed to a darker substrate or even a white gravel-Either will bring out the red coloration a bit more than what you currently have them on...
As a general rule of thumb also-20 gal rule per pygo----So be prepared for the future.
You reds would love ya bit mre also if you gave them some decore to hide under/around.I dont see much in the way of that at all-Even something like some floating plants for top cover would be nice and make them feel a bit more secure with their surroundings...
Anyhow overall you got a good start on things.
What you been feeding them-Whats your maintence like with these guys-
What you using for filtration.