320g build/journey/experiment DIY :-)

[Greenmaster]

You are right that I am putting fresh water in the tank and not salt water.
I think you misunderstood the reason for putting my rock in the ocean. I didn't put it in the ocean to build bacteria colonies I put it there because cement leaches out lime and other chemicals but the lime leaches the longest... affecting the PH, so I am flushing the system in order to get out most of the lime that is going to leach. When I realized that my rock had not finished leaching I would have put it back into the ocean but a couple of my rocks were too big to take out so I decided to just flush my tank... As for the water bill... I live in a rain forest, we pay only a yearly fee for water service, we have plenty of water here.