Diatom, Cyano, Dino or Combo

[MindlessToxin]

I'm just coming off of a 65 day fallow at 81°. It's been right around 2 weeks back now. My nutrients bottomed out while fallow and there was a small amount of brown on just the left side of the tank on the sand bed. As soon as I introduced fish back in the tank I started getting this "brown algae" all over the rocks in my tank. My levels are:
Nitrates: 5-10
Phosphates: >0.25
KH: 8
Calcium: 380
PH: 8.0
All tests done with API Saltwater and Reef Master test kits...
I have an algae reactor with Chaeto running alternate to my lights. I use Orbit Marine 48"- 60" IC LOOP PRO Dual lights. During full intensity they're ran at:
blue: 100
white: 60
red: 25
green: 25
7 hours daytime with an hour and half ramp up before and after. With a 5 hour moonlight with just 5 blue. I NOW know these aren't the best lights but it's what I got for now.

I have a One Spot Foxface, a Mexican turbo and about a half a dozen Trochus snails. None of them seem to be grazing on it..

I have a microscope ordered that should be here Wednesday. I know that will help a lot with identifying..

Youtube link

 

[MindlessToxin]

The tank has been running almost 8 months. I've had diatom bloom, green hair algae. Also cyano that I used chemiclean on and cleared up about 3 months ago.
I use RODI water. My TDS meter read 3 yesterday before mixing a fresh batch in my brute..

 

[Lavey29]

TDS should be 0. To much white light also.

 

[MindlessToxin]

The time before this it was 0 TDS. My DI resin still looks good. Maybe the RO membrane??

I'm just worried my corals will suffer if I turn my white down. Since my lights aren't the strongest. I guess I can't "have my cake and eat it too".

 

[PharmrJohn]

Have you tested for silicates? Also, does (at least some) of the problem appear to go away at lights out, only to come back with lights on?

 

[MindlessToxin]

@PharmrJohn have not tested for silicates. I will look into that.
The sand bed looks clean and white when the light go out. The rocks still have the hair algae or whatever it is on it though.

 

[PharmrJohn]

The reason i ask is that diatoms like silicates. So I would say the sand has dinos spread about. Do you have a UV set up? These kinds of dinos are sensitive to a UV treatment. You'd just have to investigate the root cause of WHY the dinos and take care of it. You could dose MB7 after the dinos are gone to create a competition for space. Also, make sure your flow is adequate and there are no dead spots.

 

[MindlessToxin]

I'm assuming if it is dinos. The bottomed out nutrients during fallow probably caused it. ?
I can try to talk my wife into a UV lol.
I should have my microscope Wednesday. Hopefully I can find someone to help me identify what it is.

 

[PharmrJohn]

Yeah.....Tanks tend to be money pits. I found that out the hard way. But now that I've gone through it, I know what to expect with my upcoming build. It's a labor of love, a reef tank is. Wait on getting the UV until your scope comes in and you've got confirmation. Now, I don't know how to ID dinos and the like using this method, but there are plenty of people here that can. I'll be following to learn a thing or two. It blows me away, some if the things that are done these days. Fifteen years ago, no one used a microscope to ID anything (at least on the forum I used to frequent). It's pretty cool!