Hey guys. I noticed an outbreak of algae in my 10 gallon. I did a full water change and washed all decorations and gravel out. Now its been about 2 weeks since the change and its back What can I do? I was thinking of completely changing the gravel. I still have like half a bag of ravel left. I was just gonna swap that with the gravel in tank. Will that do anything? Also the tank isnt in direct sunlight. Thanks.