My tank is 24" long (62cm)
The standard light tubes in the tank are 20w, 10,000k, T8
The Blue Actinic light tube one i bought is 23", 20w, T8
The LFS are now saying i can get a 18,000k tube that will allow for corals.
I dont know. Things in Australia are not as well priced as in the USA.
I...