Let's start with glass, the age-old material that has been used for many years to make all sorts of things. It is so trusted because it has its advantages, but it also has its disadvantages.
To start with, glass is much heavier than acrylic. When you consider which is the best freshwater aquarium, you will find that acrylic is the better option. It is much lighter and as a result, even the stand that you use will not be unduly strained. If you think about the possibility of an accident, you are much better off with acrylic too - it will not shatter into tiny, dangerous fragments if it ever falls down. True, the glass aquarium that you buy may be made of toughened glass and therefore hard to break, but this does not mean that it's unbreakable.
Acrylic, though much lighter, is a much tougher material. The material strands are blended in such a way that they can take a lot of strain without giving way and this is what makes it shatter-proof. Glass on the other hand will worry you if it gets even a tiny crack, because it will put strain on the entire structure especially considering that there is the weight of water to make the pressure that much more. As an aside, if you own a glass aquarium and it has a crack, consider replacing it because that is an accident waiting to happen.
Acrylic will also give you options with shape because it is mouldable without making it weaker. Glass is too, but the more you bend and play around with glass, the more delicate and brittle it tends to become. With acrylic, you will be able to get tanks in many different shapes, and you can choose the best freshwater aquarium that is something other than just square or rectangular.
If you ever need to modify your tank, maybe to put in an overflow system, go with acrylic. You can cut it easily with common tools that you can get at your tool store. Glass would require a glass expert and any holes will tend to leave the entire structure rather unstable.
Glass, because of its nature will tend to distort images and light. This means that depending on the angle from which you are looking into your fish tank, you may see that the fish and whatever else is in the tank look distorted. This will not happen with acrylic. Glass tanks also tend to be that much thicker, another factor that will distort view.
Glass does have its positive attributes though; it's a natural material and it will not discolour like acrylic. Acrylic tends to yellow with time, and because your fish tank has algae in it, if you are not very regular with the cleaning, you may find that the color of the tank has permanently changed. Glass will also outshine acrylic any day - you just can't get the same gleam however much you polish an acrylic tank. With an acrylic freshwater aquarium, you are always watching out not to scratch it - scratches are unsightly and they will affect the general attractive look of the tank.
Acrylic, because of all these qualities, will be more expensive, as well as more tasking to ship - it has to be wrapped very carefully so as not to get scratched. All that said though, you are much better off with acrylic as the best freshwater aquarium, so long as you clean it regularly enough for it not to yellow fast and avoid getting scratches on it.
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