I currently have a 40 gallon long IM tank that has two AI prime 16s on the outside and a Prime 32HD in the center. I'm currently struggling with Cyano and thought I might be able to come here and see if anyone could tell me anything with my light schedule or if this is probably too much lighting over a 40 gallon long (which I'm sure it is). I have already decided to separate the primes from the 32 HD but I'll be honest I have no idea if I'm lowering the intensity correctly. Ultimately I'm sure I need to purchase a PAR meter.

