What’s that purple circle thing and those yellow brown spots?
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The yellow/brown spots could be sponge. Can you get a clearer picture of the other?
Can I just remove them with a screwdriver or is there a better method?Definitely sponge as well. Scrape them off then gently brush the area with a toothbrush. Rinse the frag in some tank water before placing it back in the tank. Sponges can smother frags at times if left unchecked.