Oxygenating plants provide oxygen only during daylight. Fish can suffer stress during warm, still nights unless extra oxygen is supplied. Water agitation created by a splashing fountain or waterfall is ideal.

Although most pumps operate using a normal electrical supply, the installation should be a permanent one using a GFI (Ground Fault Interrupter). Always use cables and connectors designed for outdoor and water garden use. Have your system installed or checked by an electrician.