Aquarium.

Question
Hi, I have a 10 gallon fish tank. I have 5 tropical tetras in the tank, along with a dragon goby, and some kind of little bottom feeders that look like algae eaters. Unfortunately I only got a tank that is simply the tank, no lid or whatever you want to call it, but I have a filter and all the other things needed. I recently got the fish and they are doing well; However, I was curious as to whether or not I can simply add more water to the tank, because the water level goes down quicker since there isn't anything to keep the evaporating water in the tank, instead of having to take the fishes out and risk killing them.

This is probably a useless question but I really need an answer because the last time I tried to do this, I had guppies. The tap water was cleared with the safe guard stuff that purifies the water, I simply put it in the tank with the other water that was recently in there and a few days later they had white spot disease, later dying. I heard its best to let the new water sit for a day or two before adding it, but I am not sure, I've even looked for tops that go on the fish tank, but have yet to get any luck.

Thanks for any advice given.
-Jessikuh.

Answer
Hi Jessikuh,
You should remove 25% of your water siphoning from the bottom every week.  The water that you add should be the same temperature as the water in your tank.  When adding water, always use a good conditioner such as Stress Coat.  Make sure your water is always clean.  This means zero ammonia, zero nitrites, and that nitrates are low.  You can buy these small test kits at your pet store, or you could have them check your water for you.  Ammonia in water is the number one killer of fish.
I hope this helps
Lynda