seakingaquariums
Well-known member
Looks like you are off to a good start! Nice job avoiding complete disaster with the leaking tank!
The sand over the crushed coral will be fine, but will eventually settle underneath the crushed coral, and you'll just have a small layer of sand, and then crushed coral on top.
There's a lot of people who have had success using crushed coral, but honestly I would recommend removing it. Similar to how the sand will settle underneath the crushed coral, a lot of fish food, detritus, fish poo, yucky stuff will eventually settle underneath the crushed coral. There's just going to be a lot of junk underneath there! Diligent maintenance and siphoning will keep it clean, but imo its a lot harder to deal with than sand. With sand the detritus will just settle on top of the sand, making it easier to siphon out, or get blown into the water column where your skimmer can pull it out. Sand will also have a lot more surface area for bacteria compared to crushed coral.
That being said, you can still succeed with a crushed coral substrate, many people do. However if you do choose to take it out, make sure you do it slowly and add the sand slowly. Maybe take out a couple cups of crushed coral a week and add a couple cups of sand a week. A lot of your good bacteria is on your crusehd coral, so you don't want to take out your whole filtration system out at one time. Slowly do it and that way the bacteria colonies on the sand can build up to replace the missing crushed coral.
The sand over the crushed coral will be fine, but will eventually settle underneath the crushed coral, and you'll just have a small layer of sand, and then crushed coral on top.
There's a lot of people who have had success using crushed coral, but honestly I would recommend removing it. Similar to how the sand will settle underneath the crushed coral, a lot of fish food, detritus, fish poo, yucky stuff will eventually settle underneath the crushed coral. There's just going to be a lot of junk underneath there! Diligent maintenance and siphoning will keep it clean, but imo its a lot harder to deal with than sand. With sand the detritus will just settle on top of the sand, making it easier to siphon out, or get blown into the water column where your skimmer can pull it out. Sand will also have a lot more surface area for bacteria compared to crushed coral.
That being said, you can still succeed with a crushed coral substrate, many people do. However if you do choose to take it out, make sure you do it slowly and add the sand slowly. Maybe take out a couple cups of crushed coral a week and add a couple cups of sand a week. A lot of your good bacteria is on your crusehd coral, so you don't want to take out your whole filtration system out at one time. Slowly do it and that way the bacteria colonies on the sand can build up to replace the missing crushed coral.