Hi Doug and welcome to the forum
Have you had fish before?
Do you know about water changes and the filter cycle?
Can you provide us with some info about the tank and filter?
Maybe post a picture of the whole aquarium so we can check it out.
If the fish lives in a dark quiet room, they tend to become shy and hide a lot. The best place for a fish tank is in the loungeroom or somewhere a lot of people move around. Then the fish get used to having people (or animals) around them and they spend more time out in the open.
The other reason fish hide is if the water quality is not good. You can test the water for ammonia, nitrite, nitrate and pH with test kits available from pet shops or online. Or you can take a glass full of tank water to a pet shop and ask them to test it for you. Some shops charge a small fee top water testing and this is to cover the cost of the test kits.
If the fish ever looks unwell, see below for some basic first aid for them.
If you have any questions about the fish, feel free to ask. Ask questions early because the sooner you identify fish health issues, the more chance of successfully treating them.
BASIC FIRST AID FOR FISH
Test the water for ammonia, nitrite, nitrate and pH.
Wipe the inside of the glass down with a clean fish sponge. This removes the biofilm on the glass and the biofilm will contain lots of harmful bacteria, fungus, protozoans and various other microscopic life forms.
Do a 75% water change and gravel clean the substrate every day for a week or until the problem is identified. The water changes and gravel cleaning will reduce the number of disease organisms in the water and provide a cleaner environment for the fish to recover in. It also removes a lot of the gunk and this means any medication can work on treating the fish instead of being wasted killing the pathogens in the gunk.
Make sure any new water is free of chlorine/ chloramine before it is added to the tank.
Clean the filter if it hasn't been done in the last 2 weeks. However, if the filter is less than 6 weeks old, do not clean it. Wash the filter materials/ media in a bucket of tank water and re-use the media. Tip the bucket of dirty water on the garden/ lawn. Cleaning the filter means less gunk and cleaner water with fewer pathogens so any medication (if needed) will work more effectively on the fish.
Increase surface turbulence/ aeration to maximise the dissolved oxygen in the water.