Hello. Ph controller not so bad
, but need proper dropchecker even
1) Gives good monitoring 24/7
2) Without controller If big water volume and high flow, good water surface movement is very very hard gain necessary amount co2 when lights go on(cause algeas, ph swings e.g.)
Best Option - personaly for me
400L tank
controller 24/7
setup on 6.95(this point reach only sometimes in night time, maybe twice)
180 bubles/min constant rate and ph controller always under 6.95 in daytime and swing are only +-0.01
just need find proper constant bubble caunt and proper reach limit in ph.
In daytime if proper adjusted ph controller gives co2 non stop.
If will be any stop in daytime then You get co2/ph swing and if cheap china controller then realy big swing.
So need constant bubble rate adjusted.
For sample in my situation, If difference in setup on limit 7.00 PH and keeping same amount of bubbles then swing in daytime will be +-0.03 - 0.05
need proper bubble and ph limit adjusting
Good Luck with adjusting.