on a 210g tank? an in 180 would be only good for a very minimal stock list .. go bigger at least a in250 or 280... very important to suck as much crap out of tank you can... ive ordered the new bubble magus curve 9 rated suposedly for 400g for my 180g tank 240g total water volume.. if it performsm the way it rates it or teh curve 9 would be a inexpensive fit for this tank...just my 2cents
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