Copper coated zinc in fish tank as substrate

Hi Brianna, Goldfish don’t need a substrate and are fine with bare-bottom tanks.
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The most important thing to consider when choosing a substrate is your fish. Sometimes the type of fish you want will dictate what kinds of substrate you have to use. If you want fish like eels or knifefish, you need to have a sandy bottom. Eels will spend most of their time on the bottom, and if you have a rocky substrate, they will rub their bodies raw, which is bad for them. If you are considering a freshwater ray, then you need to have a large bottom with sand. They will bury themselves in the sand, which would be nearly impossible for them to do safely in a tank with gravel as the substrate. Sand will also give your tank more of a saltwater feel, which many people desire.
Is the substrate in a fish tank purely aesthetic, or is there some purpose to having it?
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1. First and foremost, the substrate serves a role in the by acting as a medium in which beneficial bacteria colonize and grow. Although the substrate is not the only host for these important bacteria, it is where a significant number of them reside. In addition to supporting bacterial colonies, the substrate is also a medium for to take root and draw nutrients. Special substrates are available that provide key nutrients for live plants.

2. Substrate creates a more natural habitat for the fish, and it's particularly important for fish that like to burrow. Bottom-dwelling species enjoy rooting in the substrate for tidbits of food that have fallen there. The substrate can also make fish feel safer, as it does not reflect images of the other fish in the tank as glass can. I'm starting to add a substrate to my fish tank and hopefully be able to successfully add live plants later.
Photo provided by Flickr1 remove the fish and put them in a bucket remove the gravel and add the new substrate while they are out of the tank?
Photo provided by FlickrAquarium substrate has various functions and should be chosen according to the type of tank, i.e. freshwater, planted, fish-only, reef, etc.
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The bottom of the tank is one of the mostneglected parts of the aquarium, and as far as many aquarists areconcerned there really isn't much to consider. In a freshwatertank, you use gravel, and in a marine tank coral sand. If the tank hasan undergravel filter, you'll need a fair depth of the stuff, butif it's just a decorative covering to hide the floor of the tank,then you only need enough to hide the glass. So is that really all youneed to know about aquarium substrates? Definitely not! Choosing anunusual substrate is a great way to give a tank a distinctive look, andmore importantly there are many types of fish that appreciate specifictypes of substrate. Gravel and sand So with fish like catfish and spiny eels -- not tomention loaches, mormyrids, gobies, earth-eating cichlids, andfreshwater flatfish -- you really want to keep them in a tank with asofter substrate than gravel. Sand is an easy to use option, butaquarists do need to bear in mind that there are at least threedifferent types they are likely to encounter. Each has its uses, butbecause of their very different chemical properties they are not allequally suitable for any given aquarium. Substrate is defined as the stuff you use as the foundation of your tank. The color, how it reacts with your water, and even the particle sizes have an impact on the health of your fish, the visual foundation of your tank, as well as the health of your other aquatic plants and creatures. I’ve explained aquarium substrate in detail in my previous post – .Different fish require different water levels and temperatures. It is important to know that the substrate you add to your tank can lower or rise the pH levels of your tank. So before you make any decision, do some research about a particular substrate and read the label especially about its reaction with water.