Turtle Tank 29 Gallon Setup For Red-Eared Slider

This is my red-eared slider turtle tank that I designed for my one turtle, Koopa! He/She (I want it to be a he) lives with other fish: 2 pink zebrafish (GloFish), 2 Siamese algae eaters, and 1 golden algae eater that’s hiding under the cliff. My filtration sources are an under-gravel filter with a pump attached and it turns on only at certain times, as well as the Decorative ReptoFilter, which is on at all times. I got this turtle the day Germany won the World Cup, which was July 13, I believe, so it’s been