I would add the entire 3.38 ounce bottle to my 30 gallon tank.. Are there any cons to using this?
Personaly I know of no cons. But I have a rule that I feel says it all.
There are three stages to everything
1. Cheap
2. Quality
3. Fast
At any one given time you can only have two of these things. Trust me. If you want something that is cheap and of good quality. It takes time. If you want it fast and good. It will cost you. If you want it cheap and fast. Quality will suffer
So be patient