Reef Octopus Algae Reactor

[RSREEFING]

Good morning everyone,

So my big tank cracked when I was moving it and I got ride of it. I have a Nuvo 20 and still have the reef octopus LR-150 algae reactor.

Now here's my question. It says it's rated for a minimum of 50 gallons, why is that?
Couldn't I just use less chaeto and reduce the light intensity?

Thank you for any advice

 

[vetteguy53081]

I’ve used undersized with success- just have to empty it more frequently