Hahaha...dun really look pro yet due to some mistakes make during the process of constructing. Will continue to improve the skill and plan for next future project if any...lol!
Those mircobubbles might be leak out from your skimmer outlet to your main tank via the return pump if it's newly installed. Let the skimmer set down for a couple days, the MB will gradually reduce to it's minimum.
Have the below items for sale.
New FIP Y Check Valve, 3/4" - S$25.00
New - Reef Plus Flow Accelerator, 1/2" - S$15 (FOC interchangeable 1" inlets )
PM me if interested.
Deal at West only.