auto-water change in a nano how much how often?

[FishyFishy!]

I do a 5 gallon water change once every 2 weeks on my BioCube 29.

I'm also skimmerless. Everything is doing fantastic with this frequency.

[claymax]

I was thinking of using two of those brs 50ml/min on timers one to pump out tank water and then one to pump in fresh sw, spaced out once or twice a day. I'd have to cut power to any ATo system of course, and time them to run in the appropriate order.

I feel like I could use a controller but those aren't cheap

[FishyFishy!]

I would do some more research on this method before you do it.

I tried this type of a setup, and it really dosn't work well at all.

[lastlight]

I think the risks involved skyrocket too with such a small volume of water to begin with. Not saying that's a reason not to try it =)

[claymax]

What risks are we talking about?

Your critiques are greatly appreciated

[lastlight]

I don't really know exactly. I think there was a thread about doing these and salinity shifts are possible. A shift when you're working with smaller volumes seems likely or no? How will these be done?

[claymax]

With brs peristaltic dosing pumps(50 ml/min) on digital timers, they say they're quite accurate....

[kien]

For starters, if one of those timers or pumps die and you don't notice, the result would likely be catastrophic. Especially in a nano.

This approach is ok so long as you are there to observe the process and can intervene if something goes wrong. I certainly would not rely on it to just work automatically 100% of the time. And by Murphy's law, that ONE time that you're not there is when it will fail.