Sillyfishies
Aquarium Advice Addict
I have 15$ to spend. Is there a way I can get glut and ferts for that much? It only needs to last a few months!
How big is the tank? API Co2 booster + a bottle of flourish comprehensive is about $17 on Amazon shipped if you have prime. Otherwise, you can rig up a DIY co2 generator for very cheap, depending what materials you may already have on hand (i.e. air tubing, yeast, sugar, silicone, and 2 liter soda bottle).
Then just get a bottle of flourish comp.