Freshwater

Cut back on the light.
Do 10 percent water changes daily until the algae clears up.
Purchase algae eating fish such as Siamese algae eaters.
Controlling chemical problems
If household chemicals are dumped or spilled into the tank by accident,
do this:
1. Remove your fish immediately to a hospital tank.
2. Completely drain your main tank and clean the decorations, tank, and
gravel with warm water before restarting your tank.
3. Replace any filter material with new material as you are setting up the
tank.
4. Remember the tank will have to biologically cycle again, so keep an eye
on the situation and add a couple fish for starters (hardy fish, such as
guppies and swordfish) until it has established itself.
Cooling a tank that’s too hot
If your tank gets too warm, follow these steps:
Chapter 18: What to Do if Trouble Strikes
1. Unplug the heater and allow it to remain in the tank. Remove the hood
and replace it with a mesh top (like the ones sold for the tops of reptile
tanks.) Do not remove the heater before it cools down or it can shatter.
Do not remove the fish or you will shock them.
2. If you don’t have an aquarium chiller (a piece of equipment that can be
added to your tank to keep the water cool), put ice into a plastic bag and
float it in the tank to slowly lower the temperature. Never try to lower
the temperature quickly as you will do even more damage to your fish.
3. Add an extra airstone to the tank to increase oxygen because the levels
will have dropped with the higher water temperatures.
4. When the temperature is back to normal, reset your heater and monitor
it closely to make sure it is functioning properly. If it is still not working
correctly, replace it.
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