TUFA
COLOR - Cream to tan and brown
REEF SAFE - Most tufa is reef safe
HARDNESS - From very soft to very hard
CORALINE GROWTH - Grows the fastest on some pieces we have tested
SHAPE - Some pieces have good shapes depending on source
This light brown rock grows coraline algae very fast. Most tufa was formed by geothermal waters rich in minerals. This can be good or bad so use reef safe tufa.
Conclusion: Most tufa was formed by geothermal waters rich in minerals. I would be very concerned about what minerals are in the rock! So is there really reef safe tufa? Interesting!
