25 Gallon Aquarium: 24 x 12 x 20 – 24 1/4 x 12 1/2 x 20 3/4

Place your freshwater aquarium setup in an area where the light and temperature of the tank won't be affected by external sources such as windows and heater vents. Sunlight that enters the room through an unshaded window could affect the temperature of your tank. This could also lead to problems for your tank down the road. You will want to place your aquarium on a stand that will be able to hold its total weight. You also want to be sure that the floor is able to support the total weight of the aquarium and stand. A good rule of thumb for determining the total weight of a full aquarium is 10 pounds per gallon of water. For example, a 55-gallon tank will weigh approximately 550 pounds when filled with water!

On the lower-end of the price range, a 10 gallon aquarium kit may include:

I am also assuming from the description of what happened that your brother is pretty young. Is there any chance that you guys could look for an aquarium at garage sales or from someone not using theirs anymore? That way, you can have a better chance to keep a nice happy place for different kinds of fish. A 10 gallon tank would be a nice size to start learning about how to keep fish.

29 Gallon Aquarium: 30 x 12 x 18 – 30 1/4 x 12 1/2 x 18 3/4

On the higher-end of the price range, a 10 gallon aquarium kit may include: The Tetra 1.5 Gallon LED Desktop Aquarium Kit is absolutely ideal for use in homes and offices or for beginning aquarists! The compact design keeps the small fish tank system easy to manage and maintain. The pedestal base provides a clean, contemporary look that complements any style of décor. At 71/4" long by 81/2" wide, this petite aquarium is perfect as a desktop fish tank in both personal and professional environments. Efficient 3-stage filtration keeps the Tetra 1.5 Gallon LED Desktop Aquarium Kit clean and odor-free for your fish. The Whisper 3i Internal Filter - fitted inside the desktop fish tank - takes easily-replaceable Bio-Bag cartridges. Bio-Bags should be replaced every 4 weeks to ensure the best water quality. Whisper 3i filters use bubbles to keep the water continuously moving, making them ideal for keeping small fish tank inhabitants healthy and safe. The Tetra 1.5 features an overhead LED lighting arm fitted with 8 white .06 watt LEDs. The light system keeps your small fish tank well-lit for your enjoyment. You can easily operate the lights with the convenient on/off switch. A single, low-voltage cable attached at the back of the desktop fish tank powers both the filter and LED light system at the same time. Tetra 1.5 Gallon LED Desktop Aquarium Kit includes: 1.5 gallon aquarium Base and integrated LED lighting system Whisper Filter Whisper Bio-Bag small cartridge Low voltage power adapter Setup guide Gravel, plants, fish and décor are sold separately.

30 Gallon Aquarium: 36 x 13 x 16 – 36 1/4 x 12 5/8 x 16 3/4

I recommend doing as lakemalawifish stated and searching craigslist or local shops for a small aquarium (10 Gallon should suffice for most fry) and having that setup as your fry factory.

40 Gallon Aquarium: 36 x 13 x 20 (High)

It's a good idea to have in mind what kind of freshwater aquarium fish you want to keep in your freshwater aquarium setup before you purchase an aquarium. Some fish only grow to be an inch or two, whereas other types of tropical fish can grow 12 or 13 inches or more in length! Knowing what kind of fish you want will help you decide the size of the tank they will need. If this is your first time with an aquarium, it may be a good idea to start with a 10 or 20 gallon aquarium setup for now and stock it with some smaller and hardier species.A good size aquarium for a small desk. It doesn't have a filter so you're limited to what you can add. I'd recommend this for low maintenance shrimps (ghost/amano/cherry) and snails. Any fish should require at least 5 gallons, goldfish even more. I added a USB LED light.

Size: Holds up to 1 Gallon (3.7L)
Dimensions: 6.2 in L x 8.9 in W x 10 in H (15.7 x 22.6 x 25.4 cm)

Aquarium supplies