03-13-2013, 08:29 PM
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My tank is a 35 gallon planted with 4 harlequin rasboras (I know, the number is way too low, had something wipe most of them out a few weeks ago) and 5 kuhli loaches.
It took the tank about a day to settle to a temperature of around 72F-73F degrees, with an ambient room temperature of 77F.
Nothing in their behavior seemed to change, the fish all ate and swam as normal. The only change I did see is today, when the ambient room temperature was lowered to 72F for a few hours, the tank dropped to around 70F-71F degrees, and the loaches were a bit sluggish and not as active. The rasboras acted normally. The ambient room temperature was then raised back to 77F and the tank now sits at 72F, several hours later.
Dunno if this is useful to anyone but it's just what I've seen through my tank. I'm most likely going to keep the heater removed, as I'm thinking it's more natural for the fish to have slightly fluctuating temperatures.