Ok, so I was cleaning my betta fish's tank and doing a water change when I noticed his rocks were slimy almost. Curious i rubbed the rock and all this green particles came up. Is this Algae? Is this good or bad for his tank? His tank is not over run by it. He is is a 5.5 gallon tank, water temp is 78°F. I just tested his water levels and his pH is 7.6 which is normal for him. I have thought about getting almond leave to bring it down but he seems fine and has been making bubble nests. His ammonia levels are low and has no nitrites and a safe level of nitrates. His tank is still cycling through. ( I didn't know a tank had to cycle before you put them in). I have been testing his water daily and I added safe start I want to say last Tuesday. Thank you! Also here is a pic of his tank currently. This is Prince .