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AH that explains the confusion there then - gravel looks similar. Considering all my fish are supposedly soft water fish, i'm concerned this is causing issues i cannot see - i also believe it stops spawning and breeding the tetras is something i'd like to do. If it is in fact the gravel - i...

in answer to your first question there were 3 different rocks. Mayybe i am misunderstanding the terms or how it's measured - i'm using a standard dip type test which gives a darker colour the higher the GH - like a litmus paper with different squares indicating different things...

Hi Jarrod thanks for the efforts here, i think maybe you missed in my initial post that the reading in the tank is 180GH, but the tap water is only 30GH - my question was why / how is this increase happening, and what are the effects. I believe it must be the stones.

Hi Jarrod, no the water is straight from the tap and measures only 30gh rather than the tank waters sky high stuff - i wonder if this is the reason my 3 lined cory's died off :( All other fish seem unaffected which is strange considering they should be in soft water - however who knows what...

Thank you nick, i have some driftwood in already, i've taken the rocks out and will do around 25% weekly (first one done this weekend) hopefully that should reduce the GH over time

THank you for the replies, goldguru that's an excellent idea about the seperate containers. i'll do that.

Thank you, presumably the hardness will stay the same until the existing water is changed with new lower GH water from the tap. I do 20% weekly so this should lower over time i guess. I'll see what happens, and hope it does actually affect it.

So i have noticed a while back that my water hardness is extremely high, like the darkest blue possible on an API test strip. I'd never really thought about it before as my prime concern being a "Newby" is to keep the Nitrite at 0 - Nitrates low and the PH stable. However i am now wondering why...

Thanks for the replies everyone, it certainly seems a point of contention then as some say prior, some say during. I will up my dosage slightly however, cheers.

Hello, My first post here, i've been dosing liquid carbon daily to my 90L tank for the last 2 weeks, i can't say i've noticed much of a difference so far, dosing at 1.5ml as per the instructions on the bottle. My question is, does it make a difference what time i inject the carbon, when the...