New upgrades tank

[Dev795]

So i had a 100g tank for almost 1 year, never had any ugly stages during cycling
I upgraded to a 180 and has been running about 2.5 months
Tank looked great, cycled with bacteria and i slowly added my live stock over to the new one, the ammonia is now 0, nitrite 0 and nitrate is now at 10 but with in the last few days this has been happening with a like green type of algae
First pic is a week ago
Second is one the wife sent me this morning before the lights turned on
Is it just a mini cycle as the tank is not mature yet?
thanks

 

[WIReefer]

Mine did the same thing nothing to worry about once I saw this in tank I added my clean up crew and just rode it out totally normal.