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Oceanographic Park of Valencia
Barcelona Aquarium

If you can, visit on a weekday, especially Tuesday or Wednesday. The crowds were way lighter, and I didn't feel rushed at all!

Definitely buy your tickets online! I saved time by skipping the line, which looked super long at the entrance. Plus, you can sometimes find discounts online

Check out the feeding times for the sharks and rays. I totally missed it but heard it was a highlight! I recommend marking it on your map when you get there.

Don't skip the gift shop! I found some cute and unique souvenirs there that you won't spot at other touristy spots. Just watch your budget, they can be a bit pricey.
Madrid Zoo and Aquarium
Palm Aquarium
Poema Aquariums
Aquarium of Seville
Aquarium River of Zaragoza
Benalmadena Underwater World

My advice is to buy tickets online in advance. I saved a few euros compared to on-site prices, and I skipped the long ticket line, which was a lifesaver!

I recommend checking out the feeding sessions. I stumbled upon a seal feeding and it was such a highlight! Make sure to grab a schedule at the entrance so you don't miss it.
Aquarium Cap Blanc

Check for discount tickets online before you go. I saved a few euros, and it made a difference for some snacks later.
I suggest getting there right as they open at 10 AM. It was way less crowded, and I could enjoy everything without bumping into other tourists