Frequently Asked Questions

General Questions

Who is Koller?

We manufacture small desk top aquariums.

Where are you located?

We are located in Shawnee Kansas

I am needing a part how do I order?

You will contact our customer service department and they will be happy to help you.

How do we contact you?

You can contact us at 800-545-1344 or email us at You can also contact us through our website under customer care or our Facebook will also help you contact us. If after hours your call will be answered by our answering service and we will return your call as soon as we are in the office again.

Is the Polymer in the aquariums as good as glass?

Yes, the polymer we use to manufacture our aquarium tanks is as safe for fish as glass. Our one piece injection molded tanks are seamless, unlike a glass tank that is made in numerous pieces and glued together. Always inspect and test all tanks for damage that can occur during transportation and handling. Place the tank in a sink or other area that cannot be damaged by water for testing. Fill the tank and let stand for at least an hour before setting up your tank.

Why are there bubbles on the top of my tank?

There can be a number of reasons for the bubbles. The tap water conditioner can cause bubbles and sometimes give the appearance of soapy water. Another reason could be the tank is going through a new tank setup cycle. An aquarium usually takes a month or so to completely cycle. During this time when feeding your fish check that the food for your fish isn't sitting on top of he bubbles were the fish can't get to it. Once your tank has cycles the bubbling or foaming should stop. Another cause for the foaming is the decorative gravel may not have been rinsed as thoroughly as needed.

My water gets very cloudy in just a few days, Why?

This is a common condition in a new aquariums as they cycle through and become a stable environment for the fish. Leave the tank alone, keeping everything in operation. The cloudiness should disappear in a few days and is not harmful to the fish. If after two weeks do a partial water change. That should fix any issues your having. If it does not please make sure there is no over crowding or over feeding that could cause any water issues.

How often should I clean my aquarium?

Please don't pick up the tank to clean the aquarium. We recommend taking the fish out of the water take a fourth (1/4) to third (1/3) of the water out using a gravel vacuum to not only get the water out of the tank but also clean debris that is at the bottom of the tank in your gravel/rocks. You will then use water that you have treated with conditioner and is room temperature into the tank replacing the water that was removed. You should never empty the tank and start over. By draining your tank completely the beneficial bacterial that fish need will be removed.

How long should I wait after setup too put my fish in?

After you have rinsed the tank and décor and placed the conditioned water in the tank we recommend 24-48 hours before you place a fish in the water. It helps the water become room temperature. By waiting it will help reduce stress to your fish.

How often should I feed my fish?

We recommend no more then once a day. When over feeding the fish you will find that your water will need cleaned more often and more debris will be at the bottom of your tank.

How many fish can I put in my tank?

The general rule for most fish is for every gallon of water is one inch of fish. However, if your wanting a goldfish we recommend 2 gallons.

How much chemicals do I put into the water?

As every company is different you will need to go by their recommended guidelines as to how much to use.

How often do I clean my tank?

We recommend that you clean your aquarium every 3-4 weeks. If the water is dirty before then you will need to clean it sooner. Over crowding or over feeding will cause you to clean more often.

How often does the light need to be on for the fish?

The fish are content with the light they get from your home. The extra light provided in our aquariums are for your enjoyment and so you can see your aquatic family members better.

What types of fish should I get?

There are many different types of fish that would work well with our various aquarium kits. Each of the fish have their own requirements on what is needed for them to have a happy life. Some require a solitary existence some like to have a school. You will need to look at which aquarium and new family member will fit best for you and your family's needs.

How can I tell if my fish is sick?

Some of the symptoms you are needing to look for is:

  1. Cloudy Eyes,
  2. Open Skin sores with reddening edges
  3. Sunken body or stomach
  4. Rapid or labored breathing
  5. Refusal of food
  6. Paleness or discoloration of the skin
  7. Fins clamped against body
  8. Ragged and/or frayed fins
  9. Excessive hiding
  10. Erratic or disoriented swimming
  11. White spots on skin or fins
  12. Scratching against decorations or gravel
  13. Red streaks in fins with abnormal lighting of the edges

If a fish shows signs of being sick, it is best to remove them from the aquarium and quarantine the fish by itself in the small tank. treat the sick fish in the quarantine tank rather then medicate and harm the beneficial bacteria. The fish should be treated with the appropriate medication to cure the infection.

Why is my aquarium turning green?

The water can turn green for several reasons:

  1. To much algae
  2. To much light
  3. To many fish

The cure:

  1. Blocking out some of the direct sunlight
  2. Polishing the aquarium by using water
  3. Water changes will reduce the green water but will not eliminate it.


  1. Regular water changes using a gravel siphon to remove waste
  2. Use of an ultra violet sterilizer
  3. Avoid overfeeding fish
  4. Do not overstock the tank

My aquarium water has a bad odor?

The first thing to do is test your water for ammonia and nitrite levels. A smell usually is a gin of excess waste usually from over crowding or excess food. First if overcrowding remove some of the fish. Then do a partial water change, and clean the bottom of the gravel. If the issue is due to over feeding please cut back. And please remember that one gallon of water per one inch of fish or if a goldfish 2 gallons per inch of fish.