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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

Check out the feeding times of the big tanks. We got really lucky and saw the divers feeding the rays and sharks, which was a highlight of our visit!
Poema Aquariums
Aquarium of Seville
Aquarium River of Zaragoza
Benalmadena Underwater World

i suggest visiting around 10 am to beat the crowds. it was much quieter then, and i had a chance to really enjoy the exhibits without rushing. later, it gets super busy

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