28 Fresh Water Aquarium 



merit, once a week in a small aquarium, and 

 less frequently in those of large size, will 

 be all that is necessary to keep everything in 

 good condition. 



It may be mentioned here that in all aqua- 

 riums with metal frames the water should 

 reach up, and slightly above the lower edge 

 of the top border. This will hide from 

 view the unsightly line of impurity, fre- 

 quently caused by evaporation of the water, 

 and will greatly add to the general good 

 appearance of the aquarium. To prevent 

 the jumping out of fishes from a tank filled 

 close to the top, a piece of netting fas- 

 tened to a wire frame the size of the top, 

 or a fine galvanized or painted wire netting 

 cut to fit the shape and size of the aquarium 

 may be placed on top of it. A plate of glass 

 is, however, preferable, as it answers the 

 double purpose of preventing the fishes from 

 jumping out and the dust from falling in. 

 To admit air to the aquarium the glass 

 should be supported by resting on the cor- 



