How do you stop fish from glass surfing?

So, to prevent your fish from glass surfing you’ll do everything you can to keep their water clean, so they don’t get feel stressed and get sick. And, you’ll avoid overstocking so they don’t feel overcrowded. The second issue is very important for semi-aggressive fish like gouramis, angelfish, and bettas.

Why is my fish tapping on the glass?

The reason being is that fish have an incredibly strong sense of hearing, and those tapping sounds are even stronger underwater. That being said, your fish may a tad shyer since tapping initiates a fear that sometimes doesn’t go away.