1. Turtle grass is a marine grass that prefers clear and calm waters. This grass will grow on sand, broken shells and mud, and has underground stems that grow 3 - 6 inches into the ocean floor. These underground stems help keep the plant in place, but they are not really roots. Turtle grass blades can be up to a foot long.
2. Turtle grass is a salt water seed plant and if the water is clear, it can grow in depths to even 100 feet! However, with the pollution of our near coastal waters it is now difficult to find almost any seagrass living below 10 feet deep!
3. Turtle Grass is the largest and most robust seagrass in Florida and the Caribbean. It is also the most abundant seagrass of the Caribbean. The leaves are ribbon-like. They are about ½ inch wide and up to 14 inches long. Turtle grass will grow in water up to 82.5 feet (25 m) and salinities as low as 20 ppt. It prefers shallower water up to 33 feet (10 m) and salinities between 25-40 ppt. Although it is the dominant seagrass in most estuaries in Florida it is relatively rare in the Indian River Lagoon.
4. These plants reproduce by means of pollination, just like land plants. Pollen from flower blooms are released by one plant, and water currents carry them to another.
The onle other thing i know is that they do not like to be exposed to air. They grow out deep enough so that they are not exposed at low tide unlike the Shoal grass.
Side note -
1. Shoal grass is an extremely important seagrass. It is a colonizer of disturbed area where turtle grass and manatee grass cannot grow. It is often found in waters too shallow or too deep for other seagrasses to grow. Of all the seagrasses shoal grass can withstand the widest range of temperatures and salinities.
2. All this info came from different sites so that is why there may be different stats.
3. It says calm water... well the areas it grows in are in wake zones so it gets a fair amount of energy. I can't see anything in your sump causing much more envergy then that.
HTH
Drew