Need help with Nitrite

Welcome to Aquaria Central! You have WAY too many fish in that tank, especially since it hasn't even finished cycling. You should only have 2 fish in there until the tank is at least 4 weeks old. So your options are to: set up another tank temporarily till the water conditions go down, or return some of the fish, or do many massive water changes everyday. If you want to do the water change route, I would do a 25% today, 50% tomorrow, 50% the next day, and 25% the following and that should bring the numbers down. Also feed really lightly until the water improves. Anyway, hope this helps and good luck.

I agree, a large water change every day will soon have your Ammonia, Nitrite and Nitrate under control. When the cycle is finished, I suggest you test your water regularly until you get a feel for how often you'll have to do a water change. If your tank stays as heavily loaded as it is, you're probably going to have to do 25% twice a week to keep the waste by-products at a manageable level.
If I were you, I'd consider taking the algae eaters back. They will get too large for your tank (4" +) and become territorial with age. Oto catfish are excellent algae eaters and stay quite small; two or three otos won't put as much strain on your filter as even one full grown algae eater.
What type of albino catfish do you have? If it's a cory catfish, it would be best to get at least one more; corys need to be in at least pairs, preferably groups. If it's an albino pleco, it will get HUGE and unfortunately you're going to have to return it; they're very messy fish.
Oh, and I wouldn't worry about water changes stressing the fish. As long as the water going in is dechlorinated and a similar temperature and pH to the tank water, the fish won't mind at all. My fish seem to enjoy water changes; when I vacuum the substrate they peck at my hand, they play in the fresh water as I pour it in, and seem very perky afterwards. I change my water at least once a week, and have never seen the fish upset by it.

I am also a little concerned about the type of algae eaters (AE) you have. If they are Chinese AE (CAE) or common plecos, you will have a problem down the road.

CAE turn into large mean fish who don't eat a lot of algae and common plecos can do a foot easily.

Water changes are not stressful on the fish when done correctly. It's easiest to use a siphon of some kind, as this will allow you to also clean the substrate of solid wastes. Most fish will skitter away from you, but they aren't stressed by having wastes removed and replaced with clean water. You can safely do up to 50% water changes without causing distress--but any detectable ammonia or nitrite is very stressful for the fish.

Lookin' good Davey Crockett (davey, davey crocket, king of the wild frontier, hehe!!) Keep up with those water changes, and soon enough you'll see 0 ammonia, 0 nitrItes, and nitrAtes will be under control with your weekly (or more often) water changes.

~Tara

You really should change enough water to get nitrite below 1 ppm, or even better, .5 ppm. The amount of nitrite you currently have is likely putting some serious distess on your fish.

Jim