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Message: [QUOTE="sub-80, post: 258058, member: 7268"] One question if I may: In another pond 50 times larger they place Nile Tilapia and during winter the fish started to die. So he asking for a heater, what size heater do I need? Each website had a different value for amount of low temp the Nile Tilapia can tolerate, am using 16C. Pond or pool heater calculators are showing 300-400Kw, which seems crazy high. Brackish Water Volume:1825m cube Surface Area: 913m sq. Desired Temp: 18C Average low temp (During Winter): 12C - 14C [/QUOTE]