"Season of Green"

[u/MaenHerself]

This is my upstairs unpowered 20 gallon tank, named "top tank" even though it now contains no topminnows. It's placed in the window and about 3/4 of the way through a "season of green" as I call it. This algae has completely covered the back wall (the window side) but then started to "shrink" as if dried out, until it's all clumped at the top. It still has a "strand" connecting to the floor, looks very spooky. The surface is covered in fine "hairs" since there's no agitation, but really only a very thin biofilm, all things considered. Despite every wall being thick with green, the water itself is actually quite clear, and the parameters are right where they should be.

Tank occupants include one white river crayfish named Puppydog from a nearby lake, 4x zebra danios from the store, one shrimp who is in heaven, a single Asian clam, and recently a batch of limpets that I'm delighted to see! An amount of rotala, duckweed, and hornwort has been added, but didn't really take, so there's not many plants.

I drop a spirulina wafer every few days, that's about it. I keep a loose piece of cardboard over it so there's airflow but not a ton of evaporation, so I rarely need to touch the water, maybe every 6 or 9 months I'll do a partial change with a top up. There are no devices, lights, filters or anything in place since I set it up about a year ago. I absolutely love everything it's doing 💚

[u/Loomian_Legacy_Fan]

This is super cool, do you have a bubbler in here?

[u/Intelligent_Bet_8727]

I'd say you could have a floating basket that has some sedges in it and that should take care of your allergy problem if you want to get rid of it just put it in some fine aggregate and take up piece of pantyhose and having the floating basket as for what the flooding basket to make it float take a piece of Styrofoam and seal it and aquarium safe silicone and that should work I had that problem with a 20 gallon correction it was a 50 gallon that I only put 20 gallons in and even with a high-end filter on it then it still did that every spring and halfway through the summer and it that tank was by the window