Some larger fish can be used in the planted aquarium without risking damage to the plants and many will make a bold and welcome addition to a display. The most popular fish in this category are the angelfish (Pterophyllum scalare), which will gracefully glide between taller plants such as Vallisneria spp. Although when fully grown, these fish will become large enough to eat smaller fish, such as young cardinal tetras (Paracheirodon axelrodi) or young harlequins (Rasbora heteromorpha), they can normally be kept with significantly smaller fish.
Many anabantoid species can become quite large, including the popular gouramis, which can reach 4-6 in (10-15 cm), although they appear larger because of their rounded shape. Some larger fish, mainly some cichlids, will use flat surfaces on which to lay eggs. They then spend considerable time
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