Tetrafauna Vitashell blocks out UVB light, which the turtle needs too keep it's shell hard, and this is what the main site says about UVB rays...
Main site wrote:UVB’s primary importance for your RES is stimulating the natural production of the vitamin D3. This vitamin is required for the metabolization of dietary calcium and together with the calcium, plays a roll in the prevention of illnesses such as Metabolic Bone Disease.
It is also oil based, which prevents air from getting to the shell, or "breathing," which can cause all shorts of problems.
If Tetrafauna Vitashell is used in thick quantities, or more often then once a mouth, it WILL stunt the turtles growth, and can also cause Metabolic Bone Disease (or VERY soft shell,which in allot of cases, leads to death of that turtle).
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RES's
Tank, SCL 3.75in.
Diesel, SCL 3in.