I had good luck with SeaChem's Stability for this. Cheaper than BioSpira and it needn't be refridgerated. Tastes better too! just kidding...
- 150g dirt tank (work in progress)
- 100g corner community tank
- 180g Native North American fish
- 85g bichir lair
- 45g flatback hex dirt tank
- 75g blackwater tank
- 40 breeder dollar sunfish