here is a picture of my conical settling tank. i was not able to integrate it into my system before i was kicked out of the house by the cheating home wrecker. another member on another forum did integrate one into their system and the only complaint they had is that the detritus sticks a little to the HDPE sides of the tank, but a simple whack with a rubber mallet fixes that.
the concept is no different than using a cesspool (sorry refugium). slow the flow down as much as possible and let the detritus accumulate in an easy to clean area instead of in hard to reach areas. i was/am going to plumb the tank directly after the drain and before the sump. i have not decided if i am going to plumb the UV before or after the settling tank, probably before. instead of using a siphon, just turn the valve on the cone end. instant nutrient removal.
i plan on putting a flow break in the tank where the conical part starts. the water will go into the tank below the flow break and exit as high up and in the middle of the tank as possible.
keeping SPS is wicked easy and very low maintenance. the only thing that makes keeping SPS difficult is keeping the phosphates out. if you remove all detritus, then the SPS grow like bonkers. they come from an oligotrophic environment. keeping poo as a pet is not what they need. with 100x flow in the display, BB, multiple CLS behind the LR structure and a flow through the sump that matched the processing ability of my skimmer, i would only spend 30min a week doing all maintenance. i would not have to put my hands in the display at all except once a month to clean the sand out that had formed from bacterial action in the LR. water changes and kalk maintained all levels even with 7 clams and plenty of SPS frags and colonies. two of the clams were over 5" long. the matched flow in the sump allowed all detritus collect there. a quick 5 minutes with the siphon and 5-10g of new ASW was all that was needed to do 90% of the maintenance.
G~