I have a 500gph circulation pump and a powerhead somewhere around 300gph. I run the circulation pump all the time and the powerhead for 15 minutes 4 times times throughout the day. Don't like the intake for the powerhead it is really strong. Could by a filter for it to protect the possible inhabitants but it is about half the cost of a circulation pump.
I am currently reading 0's for ammonia, nitrite, and nitrates ph 8.4 and alkanity around 300. Saline 1.024
But now I have a diatom outbreak which I going to say is probably from using tap water originally. My toilet and tubs are reddish now happens about 6the times a year. But I refill and when I mix my water for exchanges I use filtered water. The water is a $1.50 for five gallons and it goes through the following process: carbon filtered, uv
light, micron filter, r/o filtered, and uv
again. It would be really expensive for me to install but I wish I would have thought about in the becoming.