TROPICAL AQUARIUM FISHES 237 
Don’t use unmixed raw water from the faucet. The excess of oxygen is 
undesirable. 
Don’t fail to join an aquarium society, either as an active or a correspond- 
ing member. 
Don’t place daphnia in the aquarium without first looking carefully for 
insect enemies. 
Don’t fail to thoroughly disinfect an aquarium in which there has been a 
contagious disease. 
Don’t tear up the plants in trying to catch a fish. A little patience will 
avoid later regrets. 
Don’t be stingy, but give away a few interesting fishes to those who 
might become fanciers. 
Don’t keep goldfishes and tropicals together. They may not quarrel, but 
the appearance is not good. 
Don’t throw away dead rare fishes. Preserve in alcohol. Scientific insti- 
tutions are glad to have them. 
Don’t always use chemicals on a fish a little out of condition. A change 
of aquarium or of food may be all that is necessary. 
