Probally not a good idea to put a lion fish with a goby as the little fish could be dinner. If you get a lion fish you would have to put larger fish in and that's not advisable with a small 30g. Depending on the lionfish the volitan can grow up to the size of a basket ball with fins extended. I would do research on the fish before buying them...
Also lionfish have poisonous spines so if you intend on going in your tank lots with your hands approach with caution.
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90g starphire cube/400mhRadium20k/2 XHO/2x27w UV/2x39w T5/ 3 Trulumen led strips
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