Goldfish (Pond Size) Goldfish are a NORTHERN FRESH WATER FISH which can also survive in tropical areas just as well as it can extremely cold environments. The goldfish (Carassius auratus auratus) was one of the earliest fish to be domesticated, and is still one of the most commonly kept aquarium fish. A relatively small member of the carp family (which also includes the koi carp and the crucian carp), the goldfish is a domesticated version of a dark-gray/olive/brown carp native to east Asia (first domesticated in China) that was introduced to Europe in the late 17th century. The mutation that gave rise to the goldfish is also known from other cyprinid species, such as common carp and tench. Selective breeding over centuries has produced several color variations, some of them far removed from the "golden" color of the originally domesticated fish. There are also different body shapes, fin and eye configurations. Some extreme versions of the goldfish do need to be kept in an aquarium—they are much less hardy than varieties closer to the "wild" original. However, some variations are hardier, such as the Shubunkin. The main varieties are Common Goldfish, Black Moor, Bubble Eye, Celestial Eye Goldfish, Comet-Tailed Goldfish, Fantail, Lionhead, Oranda, Pearlscale, Pompoms, Ryukin, Shubunkins, Demekin, Ranchu, Panda Moor & Veiltail. Ours are somewhere between Common and Fantail -- with large "forked" tails, flowing fins and an array of various colors. Goldfish do a great job cleaning up a tank but they produce a high level of PH so you need either a really good filter and / or constant water changes -- especially if you're going to have these in a tank. ... https://www.youtube.com/watch?v=BXQTVUWNNqI

Seating the Lake Liner to properly conform to the floor and side walls of the pond. http://pondscape.us BTL Lake Liner (PPL-24) BTL provides custom liners for applications from oil wells on the north slope of Alaska to koi ponds in a backyard in Taipei Taiwan. From a golf course in Kuwait to a decorative stream in Haiti they have the right product, expertise and services to handle any project big or small. 100% made in the USA, their PPL® has a worldwide reputation for Strength-Commitment- Guaranteed Containment. BTL is a worldwide supplier and fabricator of liners for water and waste containment. Their proprietary PPL® liner range in thickness from 12 -36 mils and is the strongest, most cost effective RPE (reinforced polyethylene) available in their industry today. Unlike PVC liners or EPDM liners, polyethylene liners are inert and provide superior UV and chemical resistance for plant and fish safe applications and typically require no soil cover. Pondscape uses PPL-24 and we personally advocate the use of this Lake Liner for ponds of all sizes. You can buy it from us or directly from BTL -- the price is going to be the same either way :) ... https://www.youtube.com/watch?v=qrAZbks9R0Q