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I'd get that brick out and add a marine pure block. Other than that looks good.
It all looks good to me, very neat and tidy.
I would keep an eye on the Brightwell NO3 brick, I had 6 including 2 replacements and they all broke down and caused an awful sandy mess in my sump. You will probably start to see it deteriorating in a few months or if you move it around
They do work so no issues with that as such, I’ve also got a Marine Pure block that’s fine.
Having tried them both, I’ve now got 6 litres of Seachem Matrix which is very good. It’s basically fancy stone so won’t ever break down or need replacing. I’ve got mine in large mesh zip bags but you can drop it straight into the sump on its own.
Did you ‘seed it’ with bacteria ?How long did it take for the no3 brick take for you to help with nitrates? Because I’ve had it in over a month and a half and nothing?

