Refill slow is the key if its really cold. Usually just feel by hand... water sitting in the pipes is freezing cold and a few minutes later its not as cold.
Back a few years ago with my 6fters I would do about 70-80% when its cold and temps would drop slowly from 80 to about 65ish? I'm guessing all the substrate and rockwork helped from dropping too low. But refilled slowly and made sure I didn't feed on the day of wc(did wc at night).
Only once did I over do it and the fish got lethargic but once all the pumps got going they bounced right back.
Back a few years ago with my 6fters I would do about 70-80% when its cold and temps would drop slowly from 80 to about 65ish? I'm guessing all the substrate and rockwork helped from dropping too low. But refilled slowly and made sure I didn't feed on the day of wc(did wc at night).
Only once did I over do it and the fish got lethargic but once all the pumps got going they bounced right back.
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