Nice aquascaping...but one thing I noticed is you dont have much Coraline Algea growth.
Your live rock should be covered in Purple macro algae after a year of being setup. Have
you checked your Calcium and Magnesium levels?
It took about 3 months for my live rock to be covered in Coraline Purple algae.
Also that is not a proper setup for a Seahorse. Seahorses like very low flow and more
of a Mangrove / Kelp setup... You have corals that require alot of flow and not many
places for the seahorse to escape it...