I've got airline tubes, a HOB filter turbine, 2 air pumps, lots of gravel, bottles, fishbowls small tanks, small light/light bulb combination, maybe some PVC, and plenty of live plants. Anything I can do with this?
You could make a DIY co2 injector. I used to make them out of airline tubing, a 2 liter bottle, sugar water and yeast. I then ran the airline from the 2 liter into the air intakefor the powerhead. Worked like a charm and so cheap, I didn't associate a cost with it.
If you don't want to do that, you could make a skimmer for a small saltwater nano tank?