Regular channel. Thats why I wish they wouldnt sell them
I have one that i saved from a 20 gal tank in my 300, and eventually it will outgrow my 300.
If you dont have a pond you wont be able to keep it long, they grow FAST
ya they do grow huge my friend kept one in his homade pond outside and wow.. that thing was so big we had to release it it sucked but its ok we realeased it in his lake