There will probably be a couple of hang on models for aquariums 55 gallons and under. You will probably see the SeaClone and Coralife Super Skimmer, and perhaps the CPR Bakpack. But there will be nothing worth using inside a sump system.
The heater will need to be a submersible, obviously. I use Instant Ocean salt mixed to 1.023. I would set the system up in full and then ignore the tank for 2 or 3 weeks to allow the live rock and sand to really settle in. At this point copepods, amphipods, and other micro life will be present and thriving.
During this waiting period, I concentrate on alkalinity, pH, calcium, and Nitrate levels. I use Kent Marine Super Buffer DKH to keep the alkalinity at 8-12 dkh. I use Kent Marine liquid calcium (calcium chloride) to maintain calcium at 400-460ppm.
im sorry i didnt make the question clear. i have every set up and going. i don't like the wat i can look at the aquarium and see all the cords and heater and power heads. is there anything i can do to make those hidden? like a wet/dry filter of something?
You should really be able to hide the bulk of this behind the live rock bed, and direct the cords up one side of the tank. If it is really an issue, then you could go to a sump system, but it will set you back a couple hundred dollars minimum.
A skimmer won't hurt for sure. For a 10 gallon, I wouldn't be the least bit hesitant to use live rock and sand as my only filtration, especially if you can run a small hang on filter for activated carbon.