Christina it is good you are keeping your eyes open for all photo opportunities. If you take a photograph through water, unusual atmospheric conditions or tinted screens it is often beneficial to do your main colour corrections by adjusting the levels on the individual RGB channels. This would be a good photograph for you to experiment on. Below is an adjustment I did on the photograph but as I did not see the jellyfish in real life it is just a guess but gives you an indication of the changes you have the option of making.