Lets Annalise what we have here
Gust step by step.
You talk about the. Tank,
-what size is it ?
-what sand do we se on the bottom, and how old is it ?
- you tell you try to fix it froth your friend, did you move the tank? And thus moved /stirred the sand
- why where the lights off ?
- during lights off for a month, was everything Ells running ?
- what pumps douse it have and how manny to move the water ?
- ar there fish ? And do you feed anything ? And what and how often do you feed.
-is your live rock new and cured, or existing
For now my 2 cents would as mentioned by others be that some how your phosphate is way up.
It's because green water means lots of food for algae to grow, lots of food means lots of phosphate.
So when the lights where off for a mont, and now on, the tank got a shock, and things did not had. Time to settle when you put them on, and a algae bloom is poising you now.
But it is of most importance to find what is feeding your algae.
Lets not talk about bad hardware or good, lets first put everything o the table, so we can se what is all inf.uancing the operation of your tank
It could e gust a little thing, that you gust did not know, or something little you have to change.
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