Salt water Water Changes

[gordo]

I have a 70 gallon with a 20 gallon sump saltwater setup. I am relatively new to saltwater and i was wondering how often should i perform a water change? It has about 70 lbs of live rock. It was originally setup before i bought it for 5 years. I wasn't able to keep all the water so i had to add all new water when i got home and it is currently cycling.

[jvision]

Your cycle shouldn't take too long if it was set up before. I've bought complete systems and not had problems with cycling at all - the LR is key.

I would do about a 25% WC every month, and use tap water to top up. I did battle algae, and was recommended that I switch to RO for top up. Might be a better way to go.

[gordo]

Your cycle shouldn't take too long if it was set up before. I've bought complete systems and not had problems with cycling at all - the LR is key.

I would do about a 25% WC every month, and use tap water to top up. I did battle algae, and was recommended that I switch to RO for top up. Might be a better way to go.

Yeah i am going to try and use RO water from now on. I used all tap water to fill it. I am still in the process of setting something up to age my water. I heard just sticking a powerhead and heater in a separate tank or container will be sufficient.

[Osprey]

I heard just sticking a powerhead and heater in a separate tank or container will be sufficient.

Yep, that's about it. I used to use foodsafe rubbermaid containers to mix mine, now I use an old tank.