Thanks a lot for your opinion i'll work on increasing the height of the pond. may i know what kind of filtration you use for your rays?
Here’s a photo of my set up I have about about 60 litres of k1, 30bakki rods some marine pure spheres and roughly 15-20litres of other ceramics as well as purigen and a diy protein skimmer. All being said it’s all just surface area the moving bed filters do process ammonia and nitrate very efficiently. I run filter socks on my sump don’t over look the importance of mechanical filtration when designing your set up. There’s guys on here with far better knowledge then myself I’m sure they’ll chime in.