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One of the many questions @Cory gets is: How many... So, in today's inaugural episode of 'Care Forum Investigates', where average fish keepers of average intelligence attempt to solve simple problems, the question is… How many gallons of water can I put in a 10 gallon tank? I'm not the only one apparently. According to Google people have asked: Not having the fancy scientific equipment to answer the question 'How many gallons does a 10 gallon tank hold per hour?', in this episode we will confine ourselves to the 'how many gallons can I put' question. Equipment used: Non Affiliate Links Aqueon "10 gallon" aquarium: https://www.amazon.com/Aqueon-Aquarium-Fish-Tank-Size/dp/B01MRCNVSY/ref=asc_df_B01MRCNVSY/?tag=hyprod-20&linkCode=df0&hvadid=167116240456&hvpos=&hvnetw=g&hvrand=8960182847743316893&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9010107&hvtargid=pla-338193400514&psc=1 United Scientific Large Beaker: https://www.amazon.com/United-Scientific-BG1000-10000-Borosilicate-Capacity/dp/B007QO3RDA Medelco Small Beaker: https://www.fishersci.com/shop/products/pyrex-griffin-beakers-15/02540M The result after adding 37.85 liters of RO/DI tap water 25°C (but with no dechlorinator) is seen below: The aquarium began to leak at about 9.95 gallons apparently because of the lack of an unbroken seal along the top most part of the rim. Discussion: While technically possible to put 10 gallons of water in a 10 gallon aquarium, you may not be able to do so without a substantial leak. It is also possible that if we were to increase the total dissolved solids (TDS) by foregoing reverse osmosis water, that all the little solids in the water would plug the leak along the rim, thus allowing for the full 10 gallons of water. Next week on 'Care Forum Investigates': How many gallons of water can I put in a 20 gallon aquarium?