Actually based on my reading, algae also helps with the nitrogen cycle. At the moment our aquarium is on the kitchen table, which is near a window. In about three weeks we'll be moving it (during water change) to the kitchen. It will be against a wall with indirect sunlight, controlled by sun shades. While algae is ugly and makes the tank look dirty, it is also a living plant that works just like elodea. (Only it's free.) In my established tank I don't want algae, and I don't even necessarily want elodea. I just wanted something to help the cycle go easier, and faster, for my fish.
I have a 10 gallon tank. I currently have two filters - hoping I can get rid of one when things even out. (It doesn't fit in the lid, so I have the lid partially off the tank.)
My newest fish, she's bigger, she's just a little you-know-what. She's just gotten mean, and luckily I got tons of silk plants, because that's where my original female hangs out all day. The second she comes out, the new female chases and nips at her. Meanie. She apparently doesn't need company.
Testing today showed that my ammonia is at an all-time low of 0.25 which is super (I've been doing two gallon water changes, twice a day), but my nitrite is going up. I guess that's the way it's supposed to go with the cycle, but is the only "cure" for nitrites also water changes, or is there something else I should be doing? MAN I wish I'd known this water-changing thing all along. I wonder how many more of my fish would still be alive. Nitrate levels are still very very low. PH is stable - I haven't been using drops.