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It will also no doubt be very stressed, by being in an empty tank with no plants or decor to feel secure in, and by being on its own. Reedfish need to be kept n a group. They benefit greatly from physical contact with their own kind...

They don't normally shoal in a tank, is what I meant. In a tank, usually the dominant male bullies or kills the other adult males, and stresses out the females. In a tank, usually the only way to keep them is one male to half a dozen or so females.

As Colin says, only keep one male, with several females, or there'll be trouble. They don't shoal (you mentioned a shoal of them), and of course they absolutely need hard water. Is your water hard?

You never need to take the fish out of the tank. Just change some water every week (50% sounds good), adding a dechlorinator every time, and don't add anything else. Don't catch the fish unless you absolutely need to, because it's very stressful and (stress) causes diseases. You don't need to...

They have adaptations in the head (eg soft spongey bones) and brain (special proteins that protect tissue from strain), to help with the pecking stresses. They're so effective that 99% of the shock is transferred to the body. Their tongue wraps around their brain but it's not for protection...

Aerosol sprays in the room? Power outage that came back on? If it had happened straight after the water change there would be more guesses. Three days is a bit odd. The ammonia could be post-die off, but would it have spiked this soon? Any unusual behaviour yesterday? Could only one have...

The tank is big enough for a featherfin and not big enough for a Sailfin plec. As for them being peaceful, they're not. They both need a feeding territory, especially Synos, and they'll defend it if they have to against similar feeders, eg other cats. They're just peaceful towards fish that...

I know what it is, but none of these products work 100% every time as there are so many variables, so adding fish without first testing it with ammonia would be foolhardy. You need to make sure the tank is cycled, rather than put fishes' lives in the hands of an inaccurate claim made by the...

You'll need to cycle the tank's filter before you add fish. Usually takes a few weeks, although the added bacteria may shorten that time.

I've seen a 10" RTBS.

Can you get Waterlife Sterazin? Apparently it is available in South Africa...

They're often said to be ok on their own. I don't believe that. Keep a group and they'll all rest together, on top of each other like kuhlies or clown loach. If you keep one on its own you'll hardly ever see it, and when you do it'll just look stressed. Keep 2 or 3 and they'll fight, like...

I found them to be very hidey, even in a group. They'll come out and tour the whole tank when the lights go off if there are no intimidating fish, eg cichlids, but you'll hardly see them when the lights are on. Beautiful fish though, one of my favourite cats.

The EBA is a very weak hybrid. I doubt it's genes would add any robustness.

The hybrid case is strong, especially given the variety of shapes EBs come in, and all the problems they have, and the fact that no two have the same markings. DNA testing has revealed no other species but these tests have still only been done on females, and the genes involved could possibly be...

My best guess is that their genetic mutation is not confined to genes controlling colour and shape. I've kept both, including a good few EBs in shops, and behaviourally they're like two totally different species.

EBJDs have a totally different personality to regular JDs. They're very placid and wouldn't last five minutes with aggressive cichlids.

To add(?) to what's already been said, my thoughts were... If I had a belly full of worms and they suddenly died, I think I would feel a bit 'off' aswell. They'll still need to poop them out before they rot, to feel better, I guess. That may explain the sudden hiding...or the wierd taste /...

Electric Blue Jack Dempsey, very peaceful, and very fragile (most die before maturity). You'd be lucky to get it past 5".

If they're adults it could start a war but juveniles will be pretty much ignored and accepted.

It's a young male. Females, of all the colour varieties, don't have red stripes. It also has the classic male body shape.

@emeraldking

Is the water hard?

They would all be less stressed in groups of their own species. Buenos Aires just want cooler temperatures than the rest. I've found them very peaceful, but if they're too warm they can be a little feisty.

Yes

Buenos Aires Tetra, last picture.

Just leave them, they'll be fine. It's a lot safer than relying on an automated device which can go wrong.

A logical assumption if the Sun shines out of Uranus. ;)

So, solar systems and galaxies are all two dimensional (pretty much). I've always assumed that they couldn't work in three dimensions. So are atoms two dimensional in the same way?

As above. I would recommend them as a pair ideally, or a group if the tank is big enough. Pairs mean babies though, so....

Neither. It's a female Rotkeil (Red Shoulder) severum.

You have Hillstream Loaches with Discus?

Bloodworms are the larvae of midges. Mosquito larvae are the larvae of mosquitoes. :)

Good advice there, but you're in Scotland so you can do a course of Protozin in the main tank for fungal issues. In the UK (Europe) we have much milder treatments for most fish diseases than they have in the US.

I never use oral medications for fish for the reason already stated... You have little to no control of the dosage. In the uk we just add Sterazin (piperazine based) to the water to kill worms. There's none in the fish so they absorb it (osmosis) and the dosage is known and controlled. Edit...

If it's on that site, it's not true. That is an awful site riddled with misinformation. Just follow the instructions on the bottle, and steer clear of aquariumscience.org...

I rescued a young Red Hook that was possibly the thinnest fish I'd ever seen, and added it straight into a healthy happy group of assorted dollar species, but no other Red Hooks. It immediately started eating dollar poop, and pooping green (no gut bacteria). It acquired bacteria and became a...

I can't with any certainty. I guess the best species would be Otos :), but I don't think it matters much. For example I read a paper that found that every plec species studied had its own unique species of gut bacteria. Fry acquire them from their parents poop as soon as they start to eat. But...

This. It's like buying sheep and giving them dog food. They just won't recognise it as food.

Ah good, just checking. :) I'd put them both in (lots of plants?). I've had livebearers get very fat before they drop fry, and also had them drop them when they seemed quite a way off.