I have kept bat stars (Patira miniata), ochre stars (Pisaster ochraceus), california mussels (Mytilus californianus), purple sea urchins (Stronglocentrotus purpuratus), red urchins (Stronglocentrotus franciscanus), hermit crabs, giant keyhole limpets (Megathura crenulata), sea hares (Aplysia californianus), giant green anemones (Anthopleura xanthogrammica) and probably many more little things like barnacles and sea spiders. I had a converted lobster tank with a sump, so my tank was 100+ gallons.
When the temperature got around 70, I would start losing animals like the red urchins and the giant keyhole limpets. The sea stars are prone to getting some kind of infection that makes their arms fall off. Some of these tidepool animals live deeper in the tidal zone so they would be less affected by the heat because they would be in deeper water. I lost fewer animals once I installed a protein skimmer...
I think a tidepool sculpin would do fine in your tank, they don't get very big and live on the bottom.
What kinds of animals does your permit cover?
When the temperature got around 70, I would start losing animals like the red urchins and the giant keyhole limpets. The sea stars are prone to getting some kind of infection that makes their arms fall off. Some of these tidepool animals live deeper in the tidal zone so they would be less affected by the heat because they would be in deeper water. I lost fewer animals once I installed a protein skimmer...
I think a tidepool sculpin would do fine in your tank, they don't get very big and live on the bottom.
What kinds of animals does your permit cover?