Wow! You don't understand my excitement that I woke up today. I've spent the last 3 1/2 months doing everything I can to clean my fish tank. Tried endless water changes. All kinds of water operations up to the point of losing 3 fish due to the poor condition of the water that I could not clean. THEN I put this eco bioblock 2 days ago and today I woke up in crystal clear water. The disappointment has now become an occasion to enjoy. The rock is big but not too big for my 20 gallon tank. It hides nicely behind some decorations. The price-performance ratio of this stone is priceless. I would buy this again in a heartbeat. It really is that amazing. Check out my before and after photos just two days apart! Thanks to the makers of eco-biobloc stone! Update: After about two weeks, my aquarium was thrown out by a rock in a disgusting way. It's like you believe it works, it works, but it's all in your head!
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