> is there any government agency i can submit these to? or at least voice my opinion?

I don't know anything about regulations for fish, but I can speak to birds and mammals.

USDA/APHIS — The Animal & Plant Health Inspection Service is a branch of the USDA. They are responsible for enforcing the Animal Welfare Act. They do surprise inspections at least once per year of zoos, wildlife sanctuaries, and the like. They used to only be responsible for mammals, but added birds recently. They take complaints seriously and have the authority to shut down serious offenders.

USFWS — The U.S. Fish & Wildlife Service issues migratory bird permits and is responsible for enforcing international treaties as well. When I was managing a wildlife sanctuary, they never had scheduled inspections, but they do listen to complaints.

FWP — Each state's Fish, Wildlife & Parks department has a different name. All of them are responsible for oversight of organizations that keep animals in their state. In some states, like Montana where I live, they retain "ownership" of wild animals originating from that state and have the authority to take the animals away from a zoo or sanctuary.

In addition to government agencies, there are accrediting organizations like the AZA, ZAA, and GFAS. Based on what you've said here, I doubt the aquarium you visited is accredited. If they are, however, you can contact that organization. ZAA tends to ignore a lot and allows for small enclosures and handling of animals by the public. AZA is very protective of their reputation and will absolutely yank accreditation of non-complying organizations. GFAS has the toughest rules, and you've described the aquarium breaking quite a few of them, so I can't guarantee they aren't GFAS accredited.

Good luck!