Oral lesions (mouth sores) make it painful to eat and talk. Two of the most common recurrent oral lesions are fever blisters (also known as cold sores) and canker sores. Though similar, fever blisters and canker sores have important differences.
You could do a school of White Cloud minnows, they require cooler water, so you wouldn't need a heater. I think if you check the profiles, the ideal temp should be no lower than 67 degrees. Not positive.or example: my goldfish tank is fine in the summer, but my house gets so cold in the winter that I need to have a heater to keep it above 70F. Fish need a constant temperature which is one of the reasons we use heaters.
This video features the 3M Filtrete 3US-PS01 Under Sink Filter System Installation. This system does not require a separate drinking water faucet. it supplies sufficient flow for a regular kitchen faucet. With quick connect fittings and a quick change filter cartridge, this system really is easy to install and use.