Three of my four Leopard Bushfish (Ctenopoma acutirostre) were bought two years ago the size of a 20p coin, they are now ~10cm long and 7cm deep. Eventually they should reach ~14cm.
My African Butterfly Fish (Pantodon buchholzi) was bought two years ago, perhaps a fraction over 5cm long excluding the long tail fin, It is now ~7cm. I'm expecting it to reach 10-12cm.
I do not own a Featherfin Syno (Synodontis euptera), but I do have numerous syno species in my tanks (notata; decora; brichardi; congica; flavitaeniata; nigriventris; Microsynodontis polli and sp. 1). A couple of the four flavs (Pyjama) that I've had for a year have probably grown the most, going from ~8cm to ~11cm. They guttingly died in a horrid Ich outbreak back in February, but I did grow on 6 S. decora youngsters from tiny ~3cm babies to 10-12cm becoming chunky fish. Like many fish, they have their biggest growth spirt early on in life, but continue growing right upto their time is up.
Food for ABF and Ctenopoma: I feed Hikari Cichlid Gold baby floating pellets; Tetra Cichlid XL (Doromin); Tetra Prima; the bushfish seem to love Hikari mini algae wafers and the JMC catfish pellets I drop in for their tankmates!