What plants or decorations do guppies need?
Guppies do not need plants or gravel; they do not even need a heavy-duty power filter. An inside box filter powered by an air pump is all that is necessary for biological and mechanical filtration and aeration (for a 5 to 10 gallon tank). You can leave out the charcoal and weigh the box down with marbles. Paint the outside bottom of the tank with a dark paint (black is a good choice). This gives a smooth bottom for the guppy arena and no small stones will gather debris or leftover food where the guppy cannot retrieve it. Also, it is more comfortable for the guppy to rest at night on a bottom of smooth glass than a bed of gravel! This is the cleanest possible way to keep guppies.
