No problem! Okay digging into it a bit more! :)
I found both books referenced above for the app on Amazon here:
Reef Fish Of The Red Sea: A Guide to Identification by Field (1998-01-06)
https://www.amazon.com/Reef-Fish-Red-Sea-Identification/dp/B017S2BQV4
Reef fishes: UAE and Gulf of Oman Spiral-bound – 2005
https://www.amazon.com/Reef-fishes-UAE-Gulf-Oman/dp/1860631614
Here's some other books that seem helpful in regards to the content you're researching:
Coral Reef Guide Red Sea: Red Sea to Gulf of Aden, South Oman
https://www.amazon.de/Coral-Reef-Guide-Red-Sea/dp/0007159862
Underwater Guide to the Red Sea
https://www.amazon.de/Underwater-Guide-Red-Lawson-Wood/dp/1909612847
And I have a wife that's interested in Marine Biology and she's used Fishbase once, but agree - both FB and Wikipedia are hardly fun to use for any type of recreational research! Let me know if the two books above are available (I'm in the Netherlands so it's not showing the info for me), if not, I bet I can dig them up somewhere else. :)