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62 is getting into lethal territory for fish. Rocks will retain some heat. If you could use a candle to heat a stainless steel pan of water, you could dip water up, heat it, pour it in. Also, wrap your tank in a blanket, to prevent heat escaping. If you can trade pump for an hour of heater every 3-4 hours, day and night, that would help. Lower temperatures do help retain oxygen, but try to get the temp up into the high 60's.
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Sk8r
Salinity 1.024-6; alkalinity 8.3-9.3 on KH scale; calcium 420; magnesium 1300, temp 78-80, nitrate .2. Ammonia 0. No filters: lps tank. Alk and cal won't rise if mg is low.
Current Tank Info: 105g AquaVim wedge, chromis, royal gramma basslet, tailspot blenny, ocellaris clown, yellow watchman, chestnut turbo snails, bristleworms, couple of hermits.
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