Humidity issues are usually secondary to the primary problem of a compromised root system. IOW - spoiled foliage is usually caused mainly by poor root health, but can be exacerbated by low humidity. If that's the only leaf spoiling the view, you can pinch the pair of leaves off just above the healthy pair below. Two new branches will form in the axils of the leaves you left, and maybe from a pair or two below.

As long as you're learning, you might as well learn how to keep your plants nice & full by regularly pinching out the long growth.

Keep in mind that damp is good, wet is not. You want your soil to be about as damp as a well wrung out sponge - never wet. If most of your plants are small, you can also learn some tricks that will help you deal with excess water retention. It can make quite an impact of your ability to keep your plants healthy. Plants need lots of air in the root/soil mass to remain healthy.

Al

Here is a link that might be useful: Dealing with excess water retention.