Do you fill your tank up fully?

I personally do fill my tank up all of the water, I hate the way that water stains look on the tank and they are a huge pain to get rid of.

I leave a little space because it makes it less likely any water will splash out if I have to reach inside and do something, but not much.

Always I can’r stand the space between the trim and the glass if it’s not filled up high enough

Almost to the very top.

I generally fill them close to the top, and leave about an inch to an inch and a half. I hate seeing takes half empty or 3/4ths full, when it could be filled a little more safely.

I normally tend to fill mine up all of the water. For me, seeing the top of the tank below the trim (unless it’s a rimless tank) is kind of not that lovely (plus it’s wasted space where more water could be to have leveled parameters).

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I fill mine up.

We never filled the tank completely because we had fish that would jump out of the opening in the tank cover.

I wouldn't fill completely up as fish can jump out if opened

when I had a tank we didn't fill right to the top but almost

When it comes to my tank and how much water I add, I normally do fill the tank up a little over 3/4 of the way. I know that water evaporates and I will have to add more water eventually, but I normally try to keep the water around the same amount at all times.

I leave about an inch space between the water level and the brim as the bubbles from my aeration system tend to splash out.

I fill my tank just above the strip at the top of the tank but I haven't completely filled till the brim though.

I have been taking the recommendation on this from the nearby aquarium shop. And the place has guided me positively. Based on the plants, fish and overall setup they tell you how much is the right water for the tank. I follow their advice often and it worked out for me so far.

Filling the tanks to the brim may affect the fishes in the tank. They need the gap to always be able to jump up and play. You owe them that space for sure.