River Tank lower pool

This is a digital copy of the Owner’s guide and Installation guide for the 1995 model RTK-XL . This was the largest size available from Finn Strong Designs, Inc at the time.


Many people believe that they do not require oxygen as they live in water all the time. However, this is not true. Crayfish can absorb oxygen…

Best Fish Food

When it comes to fish, they won’t eat the food if they don’t like it so you have to…