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Very nice tank! Welcome to the community.
Hard to tell from the picture, but looks like diatoms on the sand more so than algae. If you don't have a cleanup crew you may want to consider one. It would probably help.

Nice looking tank! Have you ran into any issues with the HOB overflow?

Why nervous? Is there a problem with this kind? The guy from the store sold it to me, this is my first tank. I thought everyone had one of these, no?I thought about running one but it makes me nervous lol what are your stocking plans?
I may be wrong but from the pictures it looks like a HOB overflow not a drilled overflow. Am I correct? I'm not a professional lol just starting on my first reef. If its the HOB kind I have heard of people having no problems with them and some people losing syphon and overflowing their tank. I'm not trying to scare you or say its gonna happen. I'm pretty sure if you clean it often you shouldn't have any issues.
Just keep it clean and if it has the u shaped pipes, watch for air bubbles getting trapped in there. I would like to know if you run into problems though. I'm sure you will be fine.


my YT (RIP) but I've added a Sailfin Tang, a Klein Butterfly, one sea cumcuber and more guys to my cleaning crew (hermit crabs and snails). I've also added a reactor so I could reduce the nitrate and phosphate in the tank. 
