Freshwater

Looking at the injured
Check for torn fins or other bodily injuries such as missing scales after
a fight. If they do, place them separately in a quiet hospital tank with a
stress-relief formula and allow them time to heal. Check for disease that
may develop from the damage.
Solving the aggression problem
As with people, some fish just can’t seem to get along. Try these things:
If possible, permanently move the aggressive fish to another tank.
Rearrange aquarium decorations (rocks, plants, plastic divers) to break
up established territories. Build caves from rocks and give all fish places
to hide.
Made sure your fish get plenty of food. Fish that are constantly hungry
from lack of proper nutrition tend to fight more.
Correcting Feeding Problems
Often fish won’t eat due to being stressed out from the trip to your home, or
because of problems with other fish in the tank.
Getting your fish to eat
Fish can lose their appetites. Here are a couple ideas:
Chapter 18: What to Do if Trouble Strikes
Try giving them frozen brine shrimp or other appropriate aquatic treats
to kick-start them into eating again.
Rearrange the aquarium decorations to bust down territories that may
be keeping some fish from getting their fair share.
Dislodging items eaten by your fish
Add 1 level teaspoon of Epsom salt for each 10 gallons of water in the
aquarium.
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