Silly,
By no means am I an expert, however, the fish stock you have with the triggers, I believe need more space to grow and swim then a 75 gallon can provide. This observation come solely from reading all the posts here for the last 12 months.
In the end, it is your tank and everyone on here does what they wish. If I am mistaken, someone will surely chime in and correct me.
Other than that, keeping excellent water quality, skimming, etc will go a long way, however, IMO, the triggers simply need more room than a 75. :happyfish
The tank looks good. Good luck!
Dxtr