OK, that is great. Thank you very much, I will have the protein skimmer at the first compartment.
The bucket of fresh RO
water will be above the refugium, am I right? An audible noise should be fine no need for sms. Got to look for these gadgets from LFS
By the way, the refugium that I googled all have up and down flow from one section/compartment to the other and have something called bubble trap. Why bubble trap? Is it harmful for bubble to pass and flow?
This up and down flow look to me more of a risk restricting flow. As debris are going to collect in these narrow path, the water level at the pump end will be much lower and pump could run dry? Also, the first two sections, especially the first section, could over flow? Can we not have a full flow thru section dividers like the drawing attached? The total area for water flow is so much more than the narrow "bubble trap". When the bubble trap clogged or blocked the auto top up won't help. It only helps overflowing the first section as it keeps on topping up water at the pump/last section? Am I right? I need your advice before I go make the refugium. Some advices please.