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What redfoxtang said. The 3152 has a shorter time fault limit than the 3155, more suitable for nanos, and is 1/2 the price.If you want to keep salinity really stable then I would invest in an ATO! Better then filling buckets up and topping it off everyday!
Here is one that everyone loves!
Osmolator Nano 3152 Auto Top Off
Introducing the little brother to the Tunze Osmolator, one of the industry’s most trusted automatic water top-off device and BRS Recommended. Designed specifically for smaller aquariums, roughly 50 gallons and under, the Osmolator Nano 3152 is a slimmed down version of the full sized 3155. It...www.bulkreefsupply.com
You can find bad reviews on any product.What about the duetto auto top off the other one that got recommended got some bad ratings.
What about the duetto auto top off the other one that got recommended got some bad ratings.