I Have A Fish Tank Problem?

I have a 40 gallon fish tank with more or less 10 large goldfish(4 inches length) in it. No matter how capably i clean the glass of the tank, a mucus-like algae forms on the cup surface within a week. I really dont want to clean the algae daily. What types of fish and how lots would be needed to eat the algae off the sides of the aquarium. Also, would snails eat everything? What can i acquire that is friendly to my goldfish? thank you.-
Jake
go to your local pet store/fish store... ask them for an algae eater.. Get a large one, since you own a good sized tank.

You have goldfish contained by there though, those are some of the dirtiest fish to have in a container. It will get dirty in a matter of days no thing what you do but that fish should help.

DO NOT GET SNAILS!! The reproduce like CrAzY! It took me 2 months to get adjectives those little buggers out of there!

GOOD LUCK!
You can reduce the algae problem within 3 ways, buying fish to eat the algae, reducing the food levels in the cistern (to reduce nutrients in the water), or reducing light surrounded by the tank (either from the lights or sun light) Non of these things will be 100% successful though.
It's not the answer you want but get an algae magnet and clean the cup once a week.
Don't get a plecostomus though, they are tropical fish and are not suited to cold water tanks. It would survive but would you close to your house 10 degrees cooler everyday?
a plecostomus would be your best bet there the best algea eating fish you can catch snails eat algea also but they just leave streaks where on earth they clean. or i noticed that bristle nose cat fish work honest also.
more fish wont help
plecos (ALGAE EATERS) ARE TROPICAL

you have too heaps fish thats your problem

more fish = more nutriants = more algae

you can have 3 fancy goldfish maximum
but its too small for any comets/commons
Answers:    Algae rears its ugly cranium when there is an excess of nutrients, either from excess fish food and/or fish waste, as resourcefully as too much light.

First, I would cut back on the amount of food that your fish get. I would nurture your goldfish for as much as they can eat in a minute twice daily.

Second, I would cut vertebrae on the amount of light the tank gets. Try a timer for 6 hours/day, which could be 3 hours within the morning when you're home before work or school, consequently another 3 hours in the afternoon/evening when you've returned. A break in the photo period hinder algae growth.

Third, you might want to get some live plants -- even just some floating plants, like duckweed, salvinia, hornwort, etc. These plants will use up the excess nutrients that would otherwise nurture the algae.

But I would not add any more livestock to try to combat the algae. Try the three suggestions first. If they don't work, you might want to cut down on the number of fish that you do have.
Get an algae eater (plecostomus). I have one in my tank and it doesn't bother my goldfish at adjectives.
Wil my catfish put away my crustacean mix?? ?   Question around my unresponsive Platy?   Help! Is it usual for a GSP to bloat really big, make disappear its fins, and stay at the bottom of the cistern?   Light cycle for growing plants surrounded by an aquarium?