deepseadan
Aquarium Advice Activist
Hey guys, I had a reef for the last 15 years and just shut it down. Tired of all the excessive maintenance, high cost and constant battles with issues. I'm going back to freshwater. I've had many freshwater tanks in the past, but I've always had hang on back filters or sumps with bio balls and drip pans. I would like to use my current sump which has a huge refugium section in the middle, but the bio media would have to be submerged. What's the media choice for fully submerged media? Sand (worried it might get dirty in time and is tough to clean), bio balls, ceramic blocks, lava rock, or ?? I plan on keeping large fish and my tank is 150 gallons.