Aquarium Pharmaceuticals pH Up raises pH and makes aquariums more alkaline.  API pH Up is fast acting, colorless, easy to use and will not cloud or color aquarium water.
 
Increases pH levels for freshwater aquariums
For community aquariums, soft water and live-bearing fish
Will not cloud or color aquarium water
The colorless formula will not cloud or color aquarium water. Contains no phosphates, a major source of algae outbreaks.

The following pH levels are recommended for freshwater tropical fish:
Egg-laying fish: 6.6 to 6.8 (slightly acidic)
Community aquarium: 7.0 (neutral)
Live bearing fish: 7.2 to 7.6 (slightly alkaline)