Definitely a great internal surge protector as it's very quiet and thin, but I wouldn't recommend it for aquariums under 5 gallons (especially bettas). Unfortunately, you can't alter the water flow, making it a bit of a liability. I made some changes to make the water flow smaller (longer spray, water buffing pad and sponge in tube to reduce flow) and make it more comfortable for the Betta. Overall still great performance but only used for 10 gallons!
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