Hello Sabre and welcome to FF! Have not kept ACFs but here is something to read that will help: http://www.frogforum.net/care-sheet-...are-sheet.html.
Seachem Prime is fine. Do keep the water changes small or can also use a gravity trickle system to slowly replace water (airline with valve to set flow around a drop per second).
As long as they are feeding variety is the key. Make sure you have veggie matter in the mix. Not sure if OK with babies, but accidental grabs of legs can result in injuries when grown.
Think the ten of them will be fine in a 90G. The FX5 with standard sponges and Matrix should be OK for filtering, would arrange return so it does not disturb frogs. To clear the tannin from water, get a large bag of Bio Chem Zorb and rinse extreemly well. Then place in FX5 near outlet. You can discard bag when water is cristal clear again. Not sure if FX5 will work on a lower water level; maybe consulting filter manual or experimenting will answer that. Main thing is that the filter does restart by itself after a power loss.
Sorry did not answer all your questions but hopefully the more experienced keepers will get those. Good luck!





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! Have not kept ACFs but here is something to read that will help:
!
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