New - used 120 gallon tank comes with live sand- should this be replaced??
I Recently purchased a 120 gallon fish tank with most of the necessary equipment. This was a previously used tank. The tank was a little dirty and old when i purchased it and i was given advice to keep the old sand for a while before replacing it with new sand.
Should i replace the sand and clean the tank fully from the inside before i even begin anything?
I have some fish that i received with the tank that i added a day after the water settled and mixed with the sand. They seem to have adjusted to the system.
What substrate should i replace it with? many of the people i know suggest gravel (since its easier) but i think that keeping a live sand system would be better for a large tank and more beneficial to a larger biodiversity of fish.
any advice would be great. Also what type of wish would be nice to start off with? I would like to eventually have a semi-aggressive collection of fish ranging different in sizes and able to feed some species live food.
I'm assuming by live sand they are talking about a fresh water system and not salt? In freshwater as far as I've seen we call "Live" the biological filter, while salt people tend to call their biological filter "Live". If this assumption is correct then its usually recommended to let enough of the biological filter establish itself in the filter before you change out substrate so you will avoid a full blown cycle.
I personally like sand in tanks, but if you really want to replace it then gravels a good choice as it allows better water flow through it which leads to a better medium for biological filtration, plus you can gravel vac it to get alot of stuff out.
Sand is sand, heck most sand is millions of years old, unless you think its contaminated in some way or just don't like the color I would keep it
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