Two weeks ago I set up my 20 gallon walstad aquarium. About 3 days ago I stared seeing some algae growth, and my plan was to move in snails and amano shrimp. But I checked my water parameters and they were off the charts for both ammonia and nitrites. So I decided to do a water change and wait to add the shrimp and snails in. Now my aquarium is completely covered in brown and green algae, and I am worried it will kill my plants. What should I do?