Its natural for an injured animal to take up shelter to heal. You should throw in some plastic plants in there as well. More cover wil make them feel more secure.
What do you mean when you say the tank has "good lighting"? Most fish prefer subdued lighting. Its only us humans that finds a brightly lit aquarium appealling. So, you should keep the lighting down as another way to make it feel more secure.
What do you mean when you say the tank has "good lighting"? Most fish prefer subdued lighting. Its only us humans that finds a brightly lit aquarium appealling. So, you should keep the lighting down as another way to make it feel more secure.