Keeping an eye on your fish daily will help you understand what activity is normal for your fishy friends and therefore notice any unusual activity that could indicate problems in the tank.
Always test your water if you start to notice any problems as there may be an imbalance.
Fish usually need to eat 2-3 times a day.
Feed a little bit at a time, as much as the fish will eat in a couple of minutes, and use your net to take out any left-overs.
Make sure only one person in the house is feeding the fish so they don’t get over fed. More fish die of overfeeding than underfeeding.
In the very early days of your new aquarium reduce this feeding to just once or twice a day.
Just like the windows on your house, the aquarium glass will get dirty.
Algae is the most common cause of dirt on the inside of the glass, and can be removed with a magnetic glass cleaner.
Be careful to not get any gravel stuck under the cleaner because it will give the tank a nasty scratch.
The filter is the life of the aquarium, to keep the filter running correctly there should be good water flow and running as normal.
This is important for both the fish and the filter bacteria. (learn more about your filter and bacteria)
Keep an eye on your aquarium temperature, especially in warm weather.
Depending on the type of heater you have the water can rise above the needed level is the room temperature is higher than normal.
A small change should not cause a problem for most tropical fish species. If there is a significant rise, then it is important to take measures to slowly reduce it back down as oxygen is reduced as the temperature increases.