Yes, it is because without any algae some living animals in the pond would die. Algae can be food for some creatures in the pond. If your pond is just for admiring and not for living creatures, no, it isn't because the algae will take over the pond and no living creature is in it to eat the algae.
No because some other fish eat different things in a pond.
Generally you should remove the majority of green or red algae in a pond, for it could cause some serious problems. But if you have any algae eating fish (such as catfish), then the pond may be okay
Pond Snails, Tadpoles, Freshwater Shrimps and some species of fish such as the Grass Carp. Most baby fish will also feed on algae in their early years.
Algae in a goldfish pond is quite common with an increase in sun (light) and temperature. To try and keep algae to a minimum you will want to look at ways to provide the pond with shade, and regularly change out some of the water for fresh water during the warmer months.
Water lilies, cat tails, water iris, duckweed, algae, etc
Dugongs eat seaweed, some crustaceans and fish eat algae.
Algae can be found in almost any pond with some form of life in it, as it is at the very bottom of the fresh water based ecosystem food chain.
Algae is currently used in many wastewater treatment facilities, reducing the need for more dangerous chemicals. Algae can be used to capture the runoff fertilizers that enter lakes and streams from nearby farms. Algae is used by some powerplants to reduce CO2 emissions. The CO2 is pumped into a pond, or some kind of tank, on which the algae feed. Algae is commercially cultivated as a nutritional supplement.
Frogs,Toads, tadpoles, fish, algae, water spiders\ pond skaters (insect), ducks, newts, mosquito (insect), dragonfly, and snails are some organisms that live in a pond area.
other water plants might have less light to help them grow, some algae produce toxins, so the water could be poisoned, fish, like carp, that eat algae will have more food.
Spirogyra Algae lives in every pond or ditch.
I am not familiar with pebble tech so I looked it up on their web page. If you were using cement I would caution you about the lye leaching into the water and the consequent change in ph. To take that concept forward, I would question if there is any potential for the chemistry in the pebble process to end up changing the chemistry of the water. Of course that would not make a difference in a swimming pool but would certainly be an issue if you intend to put fish in your pond. My second thought is that a vital part of the biology of your pond will the the fine fuzzy hair-like algae that will eventually grow on all the surfaces of your pond. If you go to great expense to have a pretty surface, you will certainly be unhappy when that algae appears. But wait! That algae serves a valuable service in keeping your pond water clear. 1) It provides surface area for your beneficial bacteria to grow on. (it is these bacteria that compete with the algae for nutrients) 2) it consumes the nutrients that, if not consumed, will turn into 'pea soup' algae. This may not be the yes/no answer you wanted, but it will give you some questions to ask and some understanding of your pond biology. (www.rosepond.com)