What to grow
Vallisneria (usually abbreviated to ‘Vallis’) is a staple of the hobby and that’s no surprise given how easy it is to grow and how good it can look. Sometimes called ‘eel grass’, its long, strap like leaves can give a classic water weed look, swaying beautifully with the flow in your tank. It can grow very rapidly with leaves capable of reaching a couple of feet in length and laying across the tank surface.
These plants spread by runners and can swiftly populate the bottom of your tank to the degree that they may need pruning back or weeding out. A twisted leaf version, with attractive, spiralling leaves as well as a dwarf species are sometimes available.
It can struggle in soft, acidic water but otherwise it’s usually a case of keeping it under control. Many fish will nibble at its leaves, but unless you stock larger, vegetarian fish and don’t supplement their diet with veg then your Vallis will usually match or outgrow their appetites.