nice tank dude.
my only concerns are the base. none of the upright supports are at antagonist (T) angles. with the constant undulation of the water and the high room temp i dont see a 5 year life span.
I dont follow? Antagonist angles? I dont see that one, im from Norway so excuse me

The leaking was caused by a bad area of epoxy work, i think i used to much time on the applying, and at the end of the box it almost caught on fire, and that was around the leaking area. I sorted it out by putting a second layer of fiberglass and 2 more coats, no more leak..
The support was also questionable as i had 40cm c-c and that it could "sink" and make small cracks in the bottom, what i did was to put in extra support, so that it came out 20 cm c-c, those supports was movable(had 2mm left to bottom plate) and are still movable, wich means that there is no movement what so ever in the bottom.
If it helds for 4 years im happy, at that point i got motivation to tap it down and go with liquid rubber
About the geophagus, you should be

hehe.. they are frikking huge, and has the colors they are ment to have in there, i hit the jackpot with light settings.