Hmmm, clowns are actually jumpers....I'd find something to cover the tank. Egg crate(light diffusion grating from Home Depot/Lowes) is not a bad longer term solution. Near term, use a lower water level to be safe, until you find a cheap and effective cover.
If you have to medicate, no carbon, but for now I would use it.
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Scott
Current Tank Info: Glass 2.5's
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