watch out for danger signals.

1)Fish coming to the top.


reason:


1.oxygen low.


2.fish over crowded


3.high amonia and nitrite buildup.


solution.


1.change water.(not more than half,the temp. of the added water must be yhe same)


2.no over crowding.


3.provide good filtering system.


2)Water contaminated.


reson:


1.over feeding.


2.water not changed.


3.near windows.


4.no good filtering system.


solution:


1.limit the number of fish.


2.change water(not more than half,the temp. of the added water must be the same)


3.keep the aquarium away from sun light.


4.provide good filtering system.


5.feed to the requirement.


3)Fish looks lean and curved at the bottom.


1.under feeding.if this continues the fish won't recover.


4)Water becomes green.


reason:


1.aquarium exposed to sun light.


2.the lighting in the aquarium is high.





Good luck and take care.