Re: [RML] Questions regarding Rhadinocentrus

bowluvr (bowluvr at
Sat, 17 Mar 2001 08:29:07 -0800

Thanks, Gary! :-)

I actually do have a Daphnia culture going in a barrel outside, and can
still harvest a few here and there despite the cold. Soon it will be going
again like mad and then the whole fishroom will get a treat!

Those folks in the US keeping their Rhads at higher GH/KH... are they
getting fry?
And, once again, I am still curious as to your thoughts on whether or not
you think I can get any fry in the tank vs having to use mops and pull egss,
etc. Some of my bows will make babies nicely in a colony setting (fry are
born and raised up in the same tank as the parents) and some of them won't.
Heck! The Mel. pierruciae would frequently have small fry swimming in with
them in the bare tank they were in. :-) The tris I have eat their young
even when in planted tanks. I was hoping the Rhads would be more like
pierruciae than tris.

Has anyone out there raised these guys in an aquarium seeting rather than a
pond? I am not currently in a situation where I could do the pond thing, so
that isn't an option.

Julie <><

> 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
> 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
> If you don't have a culture get a 10-20 gallon set up and I'll send you
> some.
> 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
> >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
> >and are eating. They even take flake. The only fish I've kept that
> >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
> >few of them that I have, and I was hoping the fry would just grow up w/
> >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
> >3
> >> 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
> >I
> >> don't do enough water changes in the work tanks. All fish seem happy
> >enough.
> >> 3.8 is pretty acidic but I can imagine some Rhad habitats getting like
> >that
> >> 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
> >Bay
> >> 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
> >gets
> >> > so
> >> > low that Apistos are uncomfortable (3s), then I think the Rhads may
> >be
> >> > 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.
> >my
> >> > > 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
> >suggestion
> >> > > being to toss them into a pond during the summer. Some of the
> >> > forms
> >> > > make great pond fish!
> >> > > I hope you enjoy your Rhads.
> >> >
> >