aquarium lights are sold where-ever they sell aquariums ...... sold to fit the *width* of your tank ....they usually come in 1 bulb, but they are available up to 4-5 bulbs
aquarium lights use florescent bulbs ... these florescent bulbs are available in *grow lights* for plants
In fact, I use 2 aquarium lights, 48" long with 3 plant grow light bulbs that are connected to a timer
aquariums usually have a top to keep fish from jumping out ...except you do not need to use the top - just a light, laid across the top ....using *just the light* will leave gaps at the top to let moisture out ....and keep cats from getting in
for aphids .... spray plants with *insecticidal soap* (be certain - fatty acids are listed on the label) ....spray, let dry then wash dried insecticidal soap off your plants - do not skip that last step