Captain Hook said:So you are transferring all the fish from the 20 gallon into the 75? Are you adding any more, or just what was in that tank? If you don't allow any of the bacteria to die by drying up, you should be fine. The filter from the 20 is a good idea. The gravel will also help.
Have you added many plants to the 75? Once they start growing they will be taking in the ammonia as well. If your plant load is med-high and your fish load is low-med the plants might do all the biological filtration for you.
The 20 will be emptied of everything and setup as a breeding tank for snails and shrimps to be used as food.
I'm putting 2 senegal birchirs and 2 clown loaches into the 75. I'll add another clown loach in a few weeks when its completely stabilized. Then wait a few weeks and add some more fish, thinking Severum, Festivum, and an Angelfish.
The plants from the 20 will go into the 75. I'll be going by Petsmart on tuesday to purchase some more plants.
What will cause the bacteria to grow in the cannister if there is enough in the Penguin?
I planned on putting the Penguin back on the 20 but I'm afraid the 75 will cycle with its removal. I might just keep the Penguin on the 75 and buy another small filter for the 20. Then when I'm ready to set the 20 back up put the media into it.