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So... Today I got 3 oto's and my gourami nibbled all their tails so now their tails are rounded, should I put the gourami in my guppy tank? or will he do the same to them?
It sounds like you just have a nasty gourami. I can't believe he attacked ottos, that's just weird. It's not like they even share the same space in the tank. I would think he just needs to be rehomed.
If you have algae in the tank, figure out why. Don't be so quick to just have a species do the work for you. Algae is caused by things like too much light. Troubleshoot to see what's causing yours.