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I've got the same- a 75 aggressive, which can be tricky. Some fish labeled as aggressive can be less aggressive and some can be really really aggressive, haha. Also it's harder having a clean up crew, cleaner fish in an aggressive tank so it's a little harder to keep clean. But it's all very well worth it. I'd suggest pufferfish (my personal favorite), lionfish (just make sure ever other fish is bigger then your lionfish's mouth), eels (just make sure it's tightly sealed), foxface, etc. I'm still working on mine