Fish Jumping?

Hi, hope you all are well during these strange times.

Last night I was walking passed my tank and something wet hit my arm, I turn the light on and one of my ruby barbs is on the floor! I work quickly to gently scoop her up and put her back to where she belongs and all seemed well, but today she seems to be swimming at an angle?
Does anyone know if I could do anything for her? Or what you recommend to use as a jump guard?

Many thanks and stay safe,

The water isn’t near the top but the store I got the tank from didn’t provide a lid so I’ve been keeping an eye out for a lid since getting it but I’ve had no luck finding a lid for the shape and size.

...and just to add that it's likely that the swimming at an angle is caused by damage to one of the fins and it not functioning properly (as opposed to damage to the swimbladder) - my experience is that this resolves sooner than anticipated (usually less than a week). The base of the fin or one of the other fins might go quite red for a few days as it works harder to compensate but optimum water quality ought to enable that to heal naturally.

Check your water. There’s usually a reason why fish jump out.

It is possible that just walking past the tank can cause the fish to be skittish or jump. I have one particular Gourami who likes to take a dive into the internal filter box (As its completely open), I’ve just rescued him again and I’ve identified a few things that may be of some use to you @kittenbloodcoffee. Firstly I reduced my water level to perhaps a finger width from the top (helpfully marked by my filter as the minimum water level). I am short of cover from stem and floating plants and also hiding spots, I have a few but I think they are too big and can be made smaller, which means more can be added to the tank.

A Non fish related Explanation. My flat floor is made up of a concrete base, insulation and framing in the middle and topped with chip board. This is relevant to me as I think they are not supported enough or need replacing as the floor drops in certain place. Because of the weight of my stand and the tank, the fish are feeling the movement in the water as we walk past. I know this may only be relevant to me but could be helpful.

Vibration is very unsettling for fish. Some never get used to it...