I'm going to have a large CPR Aquafuge HOB unit on our new 90 gallon. My goal is to have macro algae in there to out-compete the nuisance algae (which would be in the main tank) for nutrients. Also, we want it for pod production in order to provide the inhabitants of the main tank with some good eats (my wife would like to have a mandarin when our tank is mature...). With that being said, because I feel like rambling I guess, I've got two fuge questions.
My first question has to do with the substrate in the fuge. I'm thinking about ~3" of sand (similar to the depth in the main tank). Is there a reason to have it deeper than that? I didn't know if a "remote DSB" for denitrification would apply to a HOB fuge. Also, I'm seeing this Fiji Mud stuff too. Is that worth looking into for mixing in with the sand?
My second question has to do with the lighting. I've read that it is good to put your fuge on an opposite lighting schedule than your main tank because that would keep oxygen levels in your tank higher (where you would normally see a drop when the lights are out). Is this true? Are there people out there that implement that for their tanks? Also, does this mean that pods are more likely to come out of the fuge during the main tank's daytime because it's nighttime in the fuge?
Thanks for putting up with the length of this post and thanks for any answers!
---Mike