The Koral Wood that we have are some of the nicest pieces of wood we have had for a long time. The structure of each piece is quite stunning with it's intricate shapes.
These wood were originally from China and have made its way in the aquascaping field in 2020 by being more heavier and darker in colour it replaced Gold Vine.
The only thing we found with these wood is that it does leech a lot of dark tannins!
However, that's really the only issue we have found with this wood. There are more advantages then disadvantages.. such as there are no real build up of biofilm as you do in Gold Vine.
Definitely worth a go the next time you do a tank.
Nano - roughly fits a 20L tank
Small - roughly fits a 35L tank
Medium - roughly fits a 65L tank
Large - roughly fits a 120L tank
Extra Large - roughly fits a 250L tank