I run (4) Aquaclear 802 Powerhead with the plastic filter without the filter pad in my 125 Gal. They make smaller ones but the filter is the key to keep the snails, crabs, shrimp, fish (basically anything that may get sucked in). I don't use the hose to make the bubbles since they (air bubbles) will collect under live rock and make a dead spot. For the fish only tank it doesn't matter if you use the hose or not but it will evaporate water faster and salt to collect.
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