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

i wanna set up an auto water change in my jbj 28, how much should i be changing monthly?(i know this question is pretty open ended, more or less just looking for what guidelines)

10% weekly is pretty standard.

so 2-3 gallons.

how will your water changes be automated?
you might find monthly water changes too far apart. weekly or bi-weekly can work well. but hey, everyone's tank is different.

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.

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

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.

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 =)

What risks are we talking about?

Your critiques are greatly appreciated

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?

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