tetratto in general has potentially harmful content on the tl daily. an adult may be able to handle seeing it, but this is generally not a good environment for someone younger; seeing you want your account to be a safe space, I would suggest privating and allowing mutuals to see. monitoring is good but can only go so far, as there's not a lot someone watching you can do if something bad just pops up on the timeline and you see it
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oh, it's the time line you are worried about? i added the stack thing and add close friends on there now :) before that, when i saw things i didnt like i would just block. obviously that doesnt get rid of it but i think it helps