[dennis]

I think this would work perfectly fine if a minute timer can be found cheaply. Because large coils of tubing do not seem to work well it seems adequate to dose only in the 5-10ml range for short periods. I may be able to adjust that by playing around with large "chambers" in the solution bottle. Also, a cheap timer capable of minute intervals would make magicmagani's doser a good solution for toping off a little also. I'll hit Walmart or Target tomorrow and see if there is anything under $10. I would need two doser setups so it seems that going the "cheap" route is only worth it to me if I can do the whole thing for under $30 bucks and with some degree of reliability. Otherwise, if I cannot find suitable timers and need the $25 intermatics, I might as well spend a little more and get the accuracy of peristaltic pumps that will dose the right amount in 30 minutes and use cheapy timers.

Thanks for the help so far.