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10-15 gallons is too small. Get a 50 gallon plastic barrel, put a big spigot on the bottom to change the water. I use this set up with one air pump hooked up to an airstone and a foam filter and also have a powerhead attached to a foam filter. I keep 30-60+ eels no problem. A few die now and then but not many. I get by changing the water around once a week. Put this together for around $60-70. I ussally start off with low numbers for the first 3-6 weeks until the benefitial bacteria get going .
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