Planting effects are more decorative if done in thickets and not in single stems. Obviously, the thickets should not be congested so that the individual stems have enough room to grow. Four to eight in a bunch is reasonable provided that the fish can swim about freely.
The disadvantage of plants taking in oxygen at night, instead of giving it out, is not serious if the aquarium has a large enough air surface. It helps if the aquarium light is kept on for longer periods when greenery is first planted so as to give the plants a better change to take root. This is particularly true in winter when natural growth is slow.
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