I just love fish tanks to build visual attention. It provides access using educational programming matched to the assessment of a child who struggles to attend. I place the tank in the optimal visual field. I can position the child near the tank. It is backlighted. It is moving slowly. I can pick fish of highlighting colors. The fish stay in a confined area for long periods. I can chose dark backgrounds, sand and plant life as a contrast to the fish or place a black cloth across the entire back and have fewer, larger fish.
My students love this large yellow fish!