I consider a 75 too small for any but dwarf pikes, and any pike, or any cichlid that grows more than 7.5", I consider too large for a 75.
When the bichirs and archers are adults, your tank would already be maxed stock wise.
Another problem (as mentioned above) is territoriality, and any elongate similar shaped and mouth shape cichlid such a a pike will see similar shaped fish as competitors, and tend to clash, especially in such a small tank.
The belly crawlers I had were fine with high bodied (non-similar looking non-similar mouth shaped fish), but I always kept in tanks at minimum double that size.