Great suggestion to round the corners of my skimmer platform. Will do that next time I have a reason to pull it.Have 625 G2 that has a Sump with same height 407mm and Weir height 280mm that is common to the 525 G2+. The adjustment to lower the Weir is only about 60mm. I changed from 600 Skimmer to 900 DC Skimmer just because this operates within the available Weir height whereas the 600 requires a platform - that I don't like (and shouldn't need).
Red Sea don't document the operation of the Sump - Skimmer and Weir very well. For a long time, I operated the Weir so that the Refugium area flowed through the slots into the Skimmer Section and over the Glass Screen and into the Return Chamber. The correct operation is for three levels (and a RS diagram would have helped explain this) Refugium Level drops down to Skimmer Level that drops down to Return Chamber Level. That makes the flow pass over the Weir, down through the Bubble Trap and entry at the bottom to the Return Chamber. The ATO+ has two heights and the lower one (fully pressed down) sets the water level.
I didn't like using a bought platform because RS with RS recommended Skimmer just shouldn't need one, IMHO, mine was too tall but without sufficient area to easily put the Skimmer down without worrying about the placement of the feet. Your base looks good - would it be good to round of the clear top? It is easy to catch the corners when maintaining a Sump/Skimmer. Putting the Skimmer Cup back on requires a lot of force - I wasn't sure my bought platform would take the punishment very well and the feet had a small area.
I see the intent in the sump for three levels as you describe but am not seeing it work all that well
Thanks for the feedback, it’s appreciated