Hi there, this tank is actually available in white. We recommend just looking around a little bit longer to see if you can find one.

Hello! Thanks for reaching out. Please check with the retailer. Hope you have a great day!

Acrylic 

Since it’s a 5 gallon tank, you could get the Aqueon LED Pro 10 which is a smart filter for tanks up to 10 gallons in size. When I needed to replace the filter for the 5 gallon Aqueon Minibow, I was considering getting it to replace the built in filter for the tank you have. I ended up upgrading my tank size and currently do have the Aqueon LED Pro 10 filter and it’s awesome! I sometimes have to tap it because it will occasionally make a lot more noise than it should, but then it will stop once I tap it a few times. Cleaning it is really easy and the filter pads that get changed out have their own encasement which a very nice upgrade. I believe this filter costs around $20, but honestly, from a broke college student to a fellow fish parent, it is money well spent. However, it may be too big to put on the back of the MiniBow. Overall, just look for a filter that you can hook onto the back of your tank, and one that is made for a tank no larger than 10 gallons. Which ever filter you decide to get, I also recommend looking up a video on YouTube or instructions online for how to clean the filter you purchase to make it last longer.

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Contact Aqueon.  I had same thing happen and they replaced the lid for free

This is a great aquarium for a betta fish. Fish food is a different category. Omega one is a good brand. Pellets are better than flakes but some bettas can be wicked picky.

It highly depends on the betta. Mine prefers to have all 5 gallons to himself. As such I simply have live plants in this tank and 1 betta. An emerald catfish likes to be in a group, so he might be a bit lonely on his own. Regardless the general consensus is you want 10 gallons for a single catfish. As such I wouldn't even think of placing them inside this tank.

Just go by the size of your aquarium. The aqueon filter cartridge comes in 4 sizes... XSmall for less than 5 gallons, Small for 5-10 gallons, Medium for 10-20 gallons, Large for 20plus gallons. This is my personal experience, you can always ask the fish department experts at Petco.

Goldfish actually need to be in 20+ gallons! If you have one goldfish 20 gallons would be fine but for every extra one it’s another 5+ gallons. There are a few reasons for this! 1. Goldfish produce a lot more ammonia in their waste than other fish, making it difficult to keep them in a smaller tank 2. They produce a growth inhibiting hormone into the water that will often prevent them from outgrowing their tank, but it causes a lot of health issues and leads to early death.  The best way to prevent your fish from dying or getting sick is to have it in a big enough tank, which again for goldfish is 20+ gallons!