I see you have put ball valves on your drain lines. I hope it is not to restrict the drain, as you don't have an emergency overflow. I would fear a potential flood at some point. You also have your socks tied to your drains, i would suggest using sock holders. This would be to avoid a possible flood if for any reason you failed to change your socks. The other suggestion would be to run your reactors off your return pump. You can include extra valves for possible future expansion (GFO, GAC, uv, water change outlet, etc).
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