Penguin Bio Wheel - Too Much Evaporation?

Galaxyfish

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I've got a new to me 40 gallon long, with two Penguin Bio Wheel 125s.
Yes, I realize the gph is low, and these are old filters that aren't even made anymore. But, they were free to me, and I've added some filter floss, sponges, and biomax to try to improve filtration. I do plan on adding a canister filter when I can afford to. Everything seems to be going well so far. Fish seem happy, water values are good.
But, I'm losing A LOT to evaporation. Like a gallon every 3 days. I have to replace water every 2-3 days because it drop low enough to cause the splashing to be unbearably noisy.
1. Is this normal?
2. can I slow the evaporation?
3. when I replace water (about a gallon at a time), can I just add more water, or should I change a larger portion of water?
Thanks!
 

OneLittleBubble

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You should top it off because the only thing that is evaporating is the pure H2O and not any of the impurities in the tank, which means that the ammonia, nitrate, nitrite and others are getting more concentrated
 
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