What do live plants do in cold water fish tanks?

The plants will provide additional oxygen in the water and are fine for fish to eat. Remove any dead bits of plant from the water so they don't rot in the tank to help stop the aquarium from smelling (as well as regular water changes).

The plants should also add movement to the tank from the filter outlet, which is nice.
 
i have plants that are well over a year now,give them proper light and enough food they will be around a long time.

if you get plants give them a dip in a water and cupramine solution do this a couple of times before putting them into the tank (rince with clean water before putting into the tank) this will kill off any snails on the plants
 
During the day plants photosynthesize to obtain energy and produce oxygen, the basic equation is this:

Carbon dioxide (CO2) + Light + Nutrients (in the case of aquatic plants) ----> Oxygen + Energy

Large, messy fish such as Goldfish will naturally consume aquatics plants as part of their diet. Therefore I wouldn't recommend that you mix live plants with these fish. However tough species such as Canadian pondweed (Egeria densa) can be used.

Live plants are beneficial to aquariums in many ways, they use up ammonia and nutrients such as nitrate and phosphate, which will in turn inhibit algae growth. They also provide shelter for fish and add to the overall look of the aquarium.
 
It's ok if this fish eat the plant's. It depends on what plant you get it can vary from 2-14 weeks. And yes they provide oxygen.
 
Ask the place which sells the plants. I'm thinking that they require heated water and without it they will die off pretty fast. Not only can they make the water dirty you'll probably be introducing snails to your tank & they multiply like crazy. My plants didn't live long even in a heated environment. That plus the snails made me resolve to stick with plastic plants only. Live plants produce oxygen but aren't necessary; they get the oxygen they need from the surface of the water.
 
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