Re: [RML] Questions regarding Rhadinocentrus

bowluvr (bowluvr at
Thu, 15 Mar 2001 06:02:12 -0800

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 stable,
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 and
"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 much
more skittish than Melonotaenia/Glossolepis/etc.

Julie <>,

> Julie,
> I just measured the pH in the tank behind my desk at work which is home to
> 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 because
> 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 it
> > 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 alkaline
> > 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.
> >