I see that many people like the Tropic Marine, which scares me cuz I just ordered 3 200 gal mix buckets of Instant Oceans. It was pretty cheap though 104.97 for 3 buckets with no shipping fee (34.99 each) at www.petsmart.com
i finally got my 200 gal bucket from petsmart online for 34.99 and free shipping. i ordered about 3 weeks ago and it was backordered. i emailed them that i wanted it ups not postal service and the did. alright!