Hello, and thanks for taking the time to respond.

I currently have an Albino ACF named Ribbit. I got it around 6 months ago from a walmart.
He was stuck in a sad little cup with a splash of water in it. Now he is getting pretty big with a body thats a couple inches or so.
I feed him bloodworms, canadian earthworms and feeder fish. He doesnt take to pellets or reptomin sticks. Hes a pretty viscous little frog with an appetite.
I have kept him in a 20gal long tank up until recently moving him to a new 75gal tank all to himself.
I came across a single tiny new one at a walmart in some filthy water, and took him home. As I thought it would be cool to get ribbit a buddy.
Ultimately, I would like to have them together in the 75gal tank. I know he will eat the new one right now as they are way different in size...
So im hoping that I can grow up the new one in the 20gal big enough so he wont get eaten.
My question is, have I screwed the pooch by waiting too long to get another one?
Will Ribbit sprout now that hes in a much larger tank? Therefore never giving the new little guy time to get big enough not to be eaten? Or does tank size not affect him like it does fish?
I can buy ACF'S that are even bigger than him...but the fish store wants $40 or so.
And personally I just like to see them grow from just a tiny frog.
I know this is long sorry

About the filters for them..I have read that they dont like alot of current. The 75 gal tank I got came with a whisper 30 60 hang on back filter...and a filter/bio wheel type HOB that I think is an "emporer".
The bio wheel of splashes quite a bit and the top of the water thrashes around.
My question is, will I be ok with the whisper 30 60 by itself to take away some of the "noise" or current he has to deal with? Will it be sufficient filtration?
thanks for your time