I'm looking to buy my 8-year-old a small aquarium for science ..

Can anyone give start up tips for buying and maintaining a small aquarium
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I think the one thing I'll have to respectfully disagree on is your comment toward the end of the article, stating "If you must buy one, don't be afraid to buy a red eared slider as they are one of the easiest to take care of..." Though RES are tough little snots and great turtles, they are by far not the easiest to take care of. I've found my Russian tortoises to be infinitely easier than my one 4" juvenile Red Ear Slider, and he's not even full grown! The thing about aquatic turtles that make them consistently tougher than any land-dwelling turtle or tortoise I've kept and/or cared for is the fact that you're not just taking care of a reptile, who still has all the complications of "Are the temperatures right? Is the space big enough? Am I feeding the right foods?" but also all the complications of keeping a large fish tank with a very heavy bioload--"Is the filtration strong enough? Are the ammonia/nitrates/nitrites all at safe levels? Is that algae bloom getting under control?" Making them, at least in my honest opinion, three times as difficult as the average land-dwelling chelonian. The adult size of a Red Eared Slider is by no means helpful--6-8" for a male, up to 1 full foot for a female. And if you set up a proper environment, that means you're not only maintaining a reptile, but a 75-120 gallon (or LARGER) aquarium, as well! Few people are genuinely prepared for this--to be honest, even fewer people are capable of this responsibility than are capable of caring for a relatively simple small- to mid-sized tortoise.
Where to buy small glass aquarium cheap (wholesale)
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Photo provided by FlickrBuy hot selling small aquarium pump submersible at DHgate.
Photo provided by Flickr(This tutorial will assume you have chosen a smaller tank) After you have decided the size of the aquarium you will want to buy a POWER FILTER
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Intense sunlight can produce excessive algae which are a beginner aquarist's usual problem. A cooler room temperature that is well-ventilated would be the best. Choose a large enough location for your aquarium. Set up a level and well supported area for your aquarium and stand and is highly preferred. Make sure to leave enough space for electrical connections and other equipments as well as around the aquarium for maintenance and cleaning. Properly selected aquarium will help in a successful saltwater aquarium and set up will be a breeze. It's not as hard as it may seem. The first requirement is a proper glass tank! It's a mistake to buy a small aquarium "just to get started." My suggestion is to get the largest aquarium you can afford.So why are there so many small aquarium owners? The answer must be price! Buying a complete ‘aquarium kit’ seems not only practical, but also sensible since the total cost appears to be the sticker price.It's actually better generally for first timers. But make sure it will fit your space and of course your budget. Larger aquariums are more forgiving of beginners' mistakes and provide a much more stable environment. If you buy a small aquarium, I'm pretty sure that you will just upgrade to a bigger one later on. Surface area of the aquarium should also be taken into account in aquarium set up. Oxygen enters the water and, more importantly, noxious gases such as carbon dioxide escape into the air at the water surface. So the larger the surface area, the more efficient the exchange of gases will be. Another important consideration in aquarium set up is the shape of the aquarium. There are now too many unusual shapes to choose from in addition to the usual rectangular shape. From hexagonal to octagonal, bow-fronted and even trapezoidal aquariums are available.9. Goldfish (Carassius auratus auratus) – Yes, you read that right. You should NOT buy Goldfish. They do not make good starter fish, they should not live in bowls, and they get huge. Yes, that tiny little Goldfish can get huge. In fact it can get bigger than the bowl most people keep them in. If you do love Goldfish and want some, that is great but don’t think for one second your 55 gallon tank will make a nice life home for a dozen of them. You need a pond in a perfect world but if you can’t provide that at least get the largest Aquarium you can afford/fit in your space. A lot of people will disagree with me but a 180 gallon tank is the minimum size I will suggest for a Goldfish tank, yes that is a huge tank. Goldfish eat a lot and poop just as much so not only do they take up a lot of space once they grow up, they also produce a lot of waste. So a large tank is required unless you want to do water changes every day and watch your Goldies swim in circles. If you can provide a large tank, by all means go Goldfish crazy. If you can’t do that then you should probably never buy a Goldfish. This includes some of the fancy variety of Goldfish as well, I’ve seen photos of Monster ones. I do not know if all the fancy varieties get huge though, if there are some that stay small let me know in the comments and I’ll add a note here.