Re: [RML] Questions regarding Rhadinocentrus

Gary Lange (gwlange at
Wed, 14 Mar 2001 21:14:05 -0600

Hey there are other people in the US keeping Rhads at higher GH and KH
levels that said they did alright with these fish. I don't think I would
worry too much about keeping the pH so low. A lot of fish collectors,
collecting in SA have said that their fish actually do a lot better once
they get them to harder water. They are found in that water because the
tougher fish outcompete them in the more desirable water. However they said
they did better in harder water. I think I would try the same thing with
these and not try to reproduce the exact conditions. Lots of live foods
will probably get them going. They were especially fond of chasing daphnia.
If you don't have a culture get a 10-20 gallon set up and I'll send you

Gary Lange

-----Original Message-----
From: bowluvr <bowluvr at>
To: rainbowfish at <rainbowfish at>
Date: Wednesday, March 14, 2001 9:01 AM
Subject: Re: [RML] Questions regarding Rhadinocentrus

>The thing that worries me the most about that low of a pH -- and probably
>the reason why most acid-loving fish seem to do poorly at those levels in
>aquaria -- is the inherent instability of it. The lower it gets, the easier
>and more often it fluctuates. Even feeding the fish could move it some at
>that level, and it is darn difficult to do water changes and keep it
>maybe short of pre-treating the water to make it match those parameters
>exactly. Way too much work.
>I'd rather just keep it a tiny bit higher. Like I said, the fish look good
>and are eating. They even take flake. The only fish I've kept that suffered
>no ill effects from that low of a pH drop have been Rams (Microgeophagus
>ramirezi) and Satanoperca spp.
>I suppose I could remove one of the chunks and see if it'll go a tiny bit
>lower though.
>I guess what I am really interested in is: will they spawn in the plants
>"allow" the fry to live in the tank with them, or do I have to switch to
>mops and pull the eggs out to raise them? They are in a large tank for the
>few of them that I have, and I was hoping the fry would just grow up w/ the
>parents so that I didn't have to distrub them too much. They seem to be
>more skittish than Melonotaenia/Glossolepis/etc.
>Julie <>,
>> Julie,
>> I just measured the pH in the tank behind my desk at work which is home
>> Rhads and 3 P. mellis. The JBL test kit gave me 4.5 (chart in 0.5
>> increments) and the electronic gauge gave me 4.1. This is probably
>> don't do enough water changes in the work tanks. All fish seem happy
>> 3.8 is pretty acidic but I can imagine some Rhad habitats getting like
>> naturally. The pH of our coastal acidic lakes is often low. Some of the
>> Queenslanders might have experience of low pHs in the Morton and Hervey
>> areas.
>> > -----Original Message-----
>> > From: bowluvr [SMTP:bowluvr at]
>> > Sent: Thursday, March 15, 2001 1:53 PM
>> > To: rainbowfish at
>> > Subject: Re: [RML] Questions regarding Rhadinocentrus
>> >
>> > Thanks Matthew!
>> >
>> > I use the crushed coral to keep the pH from bottoming out... when it
>> > so
>> > low that Apistos are uncomfortable (3s), then I think the Rhads may not
>> > happy either! Yes, it has gone as low as 3.8. The coral doesn't raise
>> > above neutral unless I add about 5-times as much. :-)
>> >
>> > Julie <><
>> >
>> >
>> > > Julie,
>> > > I can't help you with the sexing but as to their care...
>> > > Toss the crushed coral. Soft acidic water is the domain of Rhads. In
>> > > experience they never occur in hard water or in water that is
>> > even
>> > > when they are right next to the sea.
>> > > Temperature is less critical but avoid big daily changes.
>> > > Others on the list will tell you more about breeding, my only
>> > > being to toss them into a pond during the summer. Some of the colour
>> > forms
>> > > make great pond fish!
>> > > I hope you enjoy your Rhads.
>> >