This is going to sound really stupid probably but I'm a bit confused about water changes, When doing regular water changes every 2 or 3 weeks, 10% to 25%, am I right in thinking your taking 10% to 25% out and just topping it up with water on its own or does this water that your topping up have to be Salt Water at the right SG Level of course.
I'm sure I've read here its just pure water your topping it back up with but after thinking about this it then confused me a bit because surely your then diluting your Salt Water thats in the tank and this is then lowering your SG Levels.
Hope this makes sence and would just appreciate someone explaining the water change process on here please, and sorry if this sounds stupid
If you are taking water out then you need to add salt etc to the water you are putting back in because when you remove water you are also removing the minerals. If you are just topping up due to evaporation then you can use pure water because minerals don't evaporate, they stay in the tank. Hope that makes sense!
How come you are only changing water every 2 to 3 weeks, this doesn't sound very often for a marine tank
you 'top up' evaporaation with pure water otherwise you would make it too salty, but any water you remove from the tank needs to be replaced with water of the correct salinity. you should check sality of water currently in tank and new water each time to make sure its the same. also check the salinity in the tank if evapration occurs and you are topping up with pure water to keep an eye on it.
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