My fishes are restless

Can you expand out what you mean by tired by chance? Are they staying in the same spot? Fighting to stay in the same spot by chance? Or anything else?

Is the water current blowing them around the tank? If so, you may need to reduce the flow/current your filters are outputting.

This greatly depends on the kind of fish you are talking about and how long you have had them.

Some fish will be restless when they have been placed in a new tank and can take up to 10 days to normalize their behavior after buying them.

High ammonia or nitrate levels and even low pH can cause stress in fishes which makes them restless. Try changing your water and see.

What I feel is it might be due to the collection of fishes in your tank. If you have any carnivorous fishes or dominating fishes in you tank would cause other fishes to panic. Would advise you to keep any carnivorous or dominating fishes in separate tank if possible and to install small coral reefs or structures that would help the fishes to hide and rest. It would also make your fishes playful and vibrant.

If your fish is restless .....then it could either be stressed due to some disease or due to some factors affecting it from its environment. The first and foremost thing to do is to ascertain the cause and then look for remedies.

This sounds like stress that your fish are going through and this can happen due to either high ammonia, high nitrate levels, and also high or low PH levels.

Diseases could also be a main factor in them being stressed as well. You need to take a look at how they are acting and see if you can spot anything that may indicate disease, if there is nothing it may just be the tank environment.