What a nice store, small but wonderful selection and extremely knowledgeabe!…read more I would say on of the best in the east bay.

Aj went above and beyond to help me. I wanted a species he doesn't carry. But buying from the big…read morepet-chain meant I'd probably get sick fish as they are usually bred as feeders. AJ kindly offered to order the school AND quarantine them for me before I took them Home. He suggested testing my pond water to make sure how many fish it could handle. I took the water in--it is good--and he ordered the fish. I am impressed with the customer service and the Knowledge base. J helped me as well. New loyal customer here. I'd give more stars if I could.

parking: lot line: good…read moreservice: attentive Great selection of fish and supplies! Were willing to help make an order for something they did not currently have in stock.

I want to start to say is I was there last Saturday and boy was I amazed how different amazing…read moregreat the concord aquarium is. I was there a year ago and it was a dull atmosphere on Saturday the place was packed full of pepeople the lady that had worked very hard on the concord aquarium I just want to say you did awesome From a fish lover

Kent and Matt thank you for the great job on our messy pond. You brought it back to life. Our Koi…read moreare dancing. Very quick and efficient. Left our yard as they found it. Vickie and Leland Wardell.

The place had a bit of a smell and a lot of the tank hardscapes were covered in algae and not the…read moreclearest waters. Not the cleanest aquarium store I've been to but at least I didn't see many dead animals. The shop was dimly lit in some areas so I'm assuming that they're in the middle of re-organizing or something. Livestock price wise, i think it's reasonable. Although some tissue cultured were on the pricier side. The selection of plants and livestock were OK, I would probably only visit if you need equipment though. They have some ADA, UNS, Chihiros, CO2 tanks, etc. Here are some of the livestock prices to give you a sense of what they charge. This is not a comprehensive list but rather some livestock I was personally interested with: Prices as of June 2026: FW Fish Assorted Male Bettas - $10 Ember Tetra - $5 False Bandit Cory - $12 Kuhli Loach - $6 Longfin Bronze Cory - $10 Pea Puffers - $8 Pygmy Corydora - $6 Sterbai Cory - $15 Super Red Bristlenose - $30 Whiptail Catfish - $20 SHRIMP Amano Shrimp - $7 Bamboo Shrimp - $10 Black Tiger Shrimp - $15 Cherry Shrimp - $8 Opae Ula Shrimp - $5 Super Tiger Shrimp - $15 SNAILS Jade Mystery Snail - $5 Japanese Trapdoor Snail - $9

Came to get help with building a new tank. The staff were so helpful and gave us homework before…read moretrying to sell us anything. You can tell they actually care about fish/aquatics and want people to be successful with them. They have freshwater as well as oceanic setups and example tanks. We will definitely be back for all of our needs.

Haven't been here for two years and things have gone downhill since. Their display tank was empty,…read morethey didn't have much fish selection, but had cool anemone selection. Other than that, nothing much to see here ..: sad.

The fish are well maintained, clean tanks. The prices are competitive…read more The staff, well, once you get their attention, they are very help fun and warm. For whatever reason, they don't engage with the customers unless you request it. Odd, but the fish and shrimp are healthy, I will take that over attentive customer service any day.

Stopped by with my daughter today and picked up 20 mix neocardinas. They are all alive and well…read morewhile acclimating atm. Staff were friendly and was very helpful. They gave me 1 extra shrimp also, thank you. I would recommend this place if you are looking for shrimps, I will be coming back.

I've had a good experience with JJ Aquarium…read more The store itself isn't heavily stocked, but the owner is very knowledgeable and helpful. Even if they don't have what you're looking for in-store, they're honest about it and will often point you in the right direction for where to find it or what alternatives might work better. What stands out most is the advice. The recommendations are practical and based on experience, especially when it comes to fish care, corals, plants, and general aquarium setup. It feels more like getting guidance from someone who knows the hobby well rather than just a typical retail interaction. Overall, it's a useful local spot for information and support in the aquarium hobby, even if you're sourcing items from multiple places.

Stopped in here randomly due to the car show. Manuel was super nice and talked to us about the…read morefish's he had. He's doing a raffle for a fish tank set up! Was really amazing and super nice my gosh!! I'm considering getting a fish tank now. It's all fresh water fish no salt water. He said he's getting more beta fish's in. If you're looking for a local fish guy this is your place to be!! Come visit them!!

Gio Marine is easily one of the best local fish stores I've been to. The moment you walk in, you…read morecan tell the tanks are well cared for and the livestock is healthy, vibrant, and properly maintained. That alone already sets them apart from a lot of other places. What really makes the difference is the level of knowledge and the way they approach helping customers. Instead of just trying to make a quick sale, they actually take the time to understand your setup and what you're trying to achieve. The advice feels genuine and experience-based, which is huge in a hobby where the wrong guidance can cost you time and money. Their selection of corals and fish is solid, and everything consistently looks like it's been handled with care. On top of that, their prices are very competitive--honestly better than most other places I've come across--which makes it even easier to keep coming back. It's clear they take pride in what they do, and that shows in both the quality of the store and the overall experience. Whether you're new to reefing or have an established tank, this is a place you can rely on for both livestock and guidance. Definitely a strong option if you're looking for a dependable and knowledgeable shop.

I love taking my kids to go see the incredible fish tanks they have. They are always friendly and…read moreafter a few owners. We went in the other day and they were moving 2 doors down. Hopefully once they settle in it will be even better to go see the fish and purchase more saltwater from their giant tanks.

Very friendly staff, knowledgeable and helpful - Thank you - my fish are happy - I'll be back.read more

My husband has been coming to Tropical Fish World since he was a kid. Now we bring our kids here!…read more Over the years we have kept salt water reef tanks, fancy goldfish, and tropical community aquariums. We have counted on this local shop as hobbyist, for live & frozen food, meds, water conditioner, and fish. Dave and his wife are knowledgeable, kind, and consistent. I highly recommend this small business.