[Grammar] to worry about any of them

[Oceanlike]

I think there are errors in my writing below:

1) Many creatures in the oceans depend on poison to defend themselves or to attack. The range of these sea creatures is wide. However, swimmers, in general, do not have to worry about any of them, but the jellyfish.

2) Can I omit 'of them', and simply write, '.....do not have to worry about any, but the jellyfish."

Thank you.

 

[GoesStation]

Version 1 feels incomplete. The comma followed by but leads the reader to expect an independent clause like but the jellyfish remains a threat. If you remove the comma and change but to except, you'd have a correct sentence.

Removing of them would improve it. The extra words don't add anything.

 

[Tarheel]

Rather than attack, I would say catch their prey.