Take a little bit of regular time to enjoy your fish tank, watch the fish and their behaviour. You can tell if your fish are happy and healthy if they respond to your presence by wanting food. Be aware that fish behaviour may well change when you are present. This can be a good indicator though, if fish hide away when you are around the tank, there may well be a problem. Fish that do not come out for food may well be ill or stressed.
Some species may become a little fiesty with each other if you are present and you do not feed them. I have especially noticed this in Barb species, if you are around for a while the dominant fish may weel want to demonstrate that they are the boss. This is quite ordinary and rarely results in any serious injury. If your fish are seriously hurting each other, then you have a problem and you may want to remove one to balance out the community.
The colouration of your fish is another good indicator of tank and fish health. If your fish are looking pale you may well have a problem.
Check that the filter flow is OK, check the temperature is stable and correct, check that there isn't too much algae. Smell the water to check that there is no decay. If the water smells noticably bad, you probably have a problem.
If you see any large piles of muck, do a water change/ clean asap.
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