TROPICAL AQUARIUM FISHES _ 99 
Badis badis spawns on the inside of a small, upright flower-pot, sunk 
half way in the sand. Remove both parents when voung are first observed. 
B16 
PTEROPHYLLUM SCALARE spawn like B5 Group, except that 
eggs are deposited on glass sides or broad-leaved plants, and they do not 
bury the young, but stick them in different parts of the aquarium for 
several days. Eggs hatch in 214 days. Parents should be removed in 
eight days. To breed these fish requires a well-planted aquarium and 
plenty of seclusion. Breeders should be well fed up on mosquito larve, 
young tropical fishes or freshwater shrimps. They also eat Water- 
boatmen. Breeding temperature, from 75° to 80°. 
INDEX TO NATURE OR TEMPERAMENT OF FISHES 
Different persons will have varving experiences with the same kinds 
of fishes under apparently identical conditions. In fact one’s own obser- 
vations will sometimes change from year to year. The writer, for instance, 
has heretofore always found that Mexican Swordtail fishes kill Coral 
Snails, yet this year they are living together in perfect accord. There- 
fore we bespeak the indulgence of those whose observations do not agree 
in all details with the statements here published. The data has been 
gathered from the most experienced experts the world over, and whilz 
some minor points may, from time to time, be open to question, the main 
facts stated are authentic and should form a practical guide for the hand- 
ling of nearly all known varieties of aquarium fishes. 
N1 GROUP 
Indicates that fish so marked are of a generally peaceful disposition, 
not disposed to hunt trouble nor to persecute or devour other species 
kept with them. This data applies mainly to the Barbus group among 
tropical fishes and the Cyprinoid minnows in the temperate division. 
However, large fish of any kind take advantage of their size and tyran- 
nize over their associates more or less and also monopolize the food. So 
even if a fish is indicated “‘N. 1.” it is as well to keep only such fish 
as are of approximately the same size together—just as large young fish 
should be separated from smaller ones of the same species. 
N2 GROUP 
Fish of this class are generally amiable and peaceable and are mainly 
of the live-bearing Tooth-Carp group. Some of these, again, such as 
Gambusia affinis and varieties, Pseudoxiphophorus bimaculata, Phal- 
loceros caudimaculata and Belonesox belizanus—(this last not a Tooth- 
Carp)—should only be kept with their own species. Males which “rule 
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