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It's best to remove the hops, but it's not a deal breaker if you don't. It will just make it harder to siphon the beer later. There are 2 other options to consider...you can put the hops in a nylon or muslin bag so that the entire bag can be removed later. Or after the wort has been cooled post boil, you can pour it through a sanitized strainer into your ...
You can always open the lid and carefully take a quick look to see how it's going. Usually the sings of infection are bad smell and white mold spots on the surface. If you don't notice any of that you're good, you can also take a gravity test to see how the yeast is doing and compare it to the other batches...
It got warm, so the pressure inside the fermentor increased, forcing gas out through the airlock, which you notice as bubbles.
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