This yellow stuff started growing in my tank, I tried scrubbing it off, but it just made the water cloudy and grew back. Is it harmful??? Please help!!!!!

Hey that almost looks like brown algi i dont know much about it, but it dose happend from to murch food in tje tank and light. Give us some info on ur tank, ur ph , etc you can test ur phosphate, um how much do u feed ur fish and how long is ur light on and then lets go from ther.

Natalie what do u think this is thinking new set up?

When i got that brown algea i put a pleco in my tank and he went to town on it. It generally goes away in a few weeks though

Water changes immediately, but really for long term aquatic life to live you need something to break down the waste, either benificial bacteria or live plants

My tank is 10 gallons, I have a fancy goldfish(just got rid of two other goldfish), 4 tetras, 1 guppy fry in a breeder box, 2 small apple snails, 1 medium apple snail. I have the breeder box, a decorative vase(as seen above), a bubbling volcano, and 4 fake plants plants. Oh!!!, and a ghost shrimp! I have a Aqueon 10 power filter, just replaced the filter last Wednesday. An a 50w heater, the bubbler, and a automatic feeder. Does this help? The fancy goldfish seems to be pooping A LOT. Is this due to over feeding? My dad took care of my tank for the weekend, and forgot about the auto-feeder, he also "accidentally" put about 20 pellets in the breeder box with the guppy. I got the snails this weekend, and they have already reduced the algae. Please help, I am new to fish-keeping, and am so far enjoying it. This all started with that guppy fry... lol