Streams, ponds, and lakes carry a myriad of insect larvae, crustaceans, and zooplankton. Many of these bugs are predators and will happily prey before your eyes on feeder guppies, goldfish, or minnow fry. Many zooplankton species can be kept separately in very small aquariums and observed in incredible detail under a microscope. For more information on the realm of possibilities, refer to the Audubon, Golden, or Peterson Guides for reptiles, amphibians, and insects. All should be available at most book stores.
Most timers have an override switch which is handy for after hours viewing.
Next time the aquarium is cleaned, insert the intake port directly into the filter plate and the outlet nozzle pointed toward the front glass of the aquarium. If the fit is not tight, try the adapters which come with the powerhead or use silicone to glue it in place, but avoid plugging the intake screen. Drill a straight line of holes into one side of the tube which will direct current lengthwise across the bottom of the aquarium. Select two slabs of limestone or shale which will fit between the powerhead and the front glass and carefully sandwich the wand between slabs. Lodge small rocks in the crevice to keep weight off the wand and support the upper slab.