At a school it prolly gets high levels of artificial light sufficient to keep the algae going, unfortunately. And didn't you have sun hitting a portion of that tank (which will make it darn hard to control temp) Cover that corner with a double side decorative background.. And doesn't you indulgent and lame teacher want a project with egglaying fish...
You were asking about danios and we said "get rid of the feeder fish" then?
Those feeder fish are no where near adult..meaning breeding.... and a 55 cant do it then, anyway. They are are just taking up water oxygen, filtration abilities and space. I love golds but this is not a place for them with your class plans! How big are they now? 4-5 inches? bigger?
I thought you had got Kribs for the school tank and were trying to get it running stable?
For the golds for now..turn the heat down just around 70.
Need current tank stats..
Size of the golds
Type filter(s)
Ammonia/nitrite/nitrate
and the
ph in your region was somewhat hard and alkaline wasn't it?
As this has been ongoing since the Christmas Holidays season..I say strip that &*%^! 55 and just start over! Save some media in a bucket of the original water with the filter. And keep an eye on the algae when it tries to return. Throw a ton of algae eating shrimp in there while you do a careful mini cycle. Get some loaches or something..or cories..at least then if nothing else is decided maybe they will breed in all that space.
Give those feeders away! And if they were yours take em back home so they are not slowing the project down and using the class budget in the meantime. To a pond keeper. Or trade at a small local pet store for some credit. Having them has wasted 3 months of valuable time that you would have fry by now...
With them in there it is like having only a cold water 30 gallon and still your occupants cant fit in their mouths. And can't lay in the open (carp golds will eat the eggs and fry
asap). All these restrictions for two fish that are going to outgrow that tank is just ludicrous. WHY -why -why?are they still there? :? :?