Bro this is awesome. I love keeping obscure, bottom dwelling marine species as well. Lizardfish are amazing just be careful as they can eat puffers with no ill effects. Here is florida we regularly get sargassum on the beach and in the water, 9 times out of 10 I find at least 1 sargassum fish. Have 13 currently, feeding them shrimp and they love hiding in sargassum. Interestingly, the sargassum stays alive in the aquarium so that's a bonus.