i am a little confused about water changes.
1)I am curious how much and how often I should change the water if I have a 29g with LR and PS with sump/refugium with dsb. I only want a royal gramma, a small goby and a pistol shrimp.
2)Would 20% weekly water change be sufficent?
3)what is the most cost efficent method of obtaining water for changes? I don't have enough $ to buy a RO/DI unit and I don't understand the difference between using RO/DI or distilled water.
1)I am curious how much and how often I should change the water if I have a 29g with LR and PS with sump/refugium with dsb. I only want a royal gramma, a small goby and a pistol shrimp.
2)Would 20% weekly water change be sufficent?
3)what is the most cost efficent method of obtaining water for changes? I don't have enough $ to buy a RO/DI unit and I don't understand the difference between using RO/DI or distilled water.