FishyReef
Broke Reefer!
So I do not have enough money to invest into an RO system. Can I use distilled water bought from the store?
Yes you can, or you can usually buy salt water or RO/DI water from your LFS. Since you only have a 10g tank, it won't be ridiculously expensive to just buy your water. I thought about buying water in the beginning for my 90, but when I discovered a gallon of distilled water was $1, that would be $90 to just fill my tank - suddenly the RO/DI didn't look so expensive lol ;)