We have had a cold water marine too but no pics sorry (before digital cameras )
We made ours a rock pool marine and it had all sorts in it, even a tiny octopus (until he escaped). We had chitons, brittlestars, starfish, anemones, sea cucumbers, a hermit crab, lots of shrimp, rockfish and triplefins to name a few.
Had major problems in summer though as, without a chiller, we could not keep the temperature low enough. Even rock pool dwellers can only tolerate warmer temperatures for a short period.