i have a spare 10gal tank that id like to set-up as a cold marine tank, i can do it all for free for i live close to the see and i plan to get the creature from rock pools? would this work? could i go get a bucket of sand from the water, then go get some large rocks from the sea and finally after all is set-up go and get some creatures? would this work? really all i nead is a filter or daily water changes? what do you think?