An idea
I got an idea while reading this.....
Maybe have a second container of water (ie an old rectangular aquarium etc.) placed in a location near the decorative vase, but out of site.
Place the filter and heater in the second holding tank. This would filter and warm the water in the "system".
Install a circulating pump to move water from one container to the other and back. Then you'd only need two small tubes (going and returning pipes) viewable in the vase. If the second tank was below, you'd need to the pump the water up, and have a gravity fed overflow return hose.
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