im thinking of trying to throw together a cheap canister style filter for my 10g shrimp tank. i was planning on using a cheapy inline water pump to move the water and maybe just a series of sponges for the internal (since its very low bio load). i want to stay away from air driven filters, and my AC 20 is stopping me from having floaters.
i have that done in my 55g and ac 70, in a 10g tank i think it looks awful. i was thinking a 4$ pump would be all i need. i have litterally hundreds of feet of all sorts of sized tubing and attachments for them and i can get a seasoned filter out of my spare AC 50.
In my 10G shrimp tank, I use a small in-tank filter (the one that came with the 10G starter set). To keep baby shrimp out of it I buried the filter in a pile of Aquarium gravel behind an ornament. It makes a nice small waterfall, keeps the babies out and I can hardly even see it. If I blacked out the back of the tank it would certainly be invisible.
You can make an in tank 'canister' out of a powerhead, a water bottle and some filter floss. Cut holes in the bottom of the bottle, fill the bottle up with filter floss and/or ceramic media, put the power head in the top of the bottle and you have yourself a cheap DIY shrimp friendly filter.