My enthusiasm for twice daily water testing evaporated very quickly, especially when the number of fish tanks in my home increased. Water testing became a once a week thing for a while, then once a fortnight, then employed only when fish either didn’t look healthy or were found dead.
My fish looked energetic, had no marks on
their bodies, ate well and not too often, and in three of my tanks the fish
were continually breeding, or attempting to breed. I figured I must be doing
something right and stopped stressing about the water quality. I had plenty of
other things going on in my life that were stressing me out and I felt relief
at being able to scale back a bit on aquarium maintenance.
For most fish, the slightest trace of ammonia can be deadly
and the goal is to have zero trace of it in the tank. The ammonia test kit that
I use displays the water reading by change of colour, from bright yellow for no
traces of ammonia and a dark green reading for high concentration of ammonia.
The difference in colour between having a zero reading
(bright yellow) and a reading of 0.25 parts per million (ppm) is slight (yellow
with a greenish tinge) and readings of under 0.25 ppm are very hard to detect.
The best rule of thumb to use is the lower end of the spectrum – if the water
isn’t bright yellow and looks pale yellow it is safer to assume
there is ammonia in the water and do a 30% water change*.
I had found that out the hard way once before, by putting
fish in another tank that had a slight trace of ammonia and losing most of
them. One of the problems is that API’s freshwater ammonia color card does not
display the “pale yellow” in-between reading, meaning that, like a lot of other amateur
aquarists, I have made the mistake of believing that test colour of any shade of
yellow means everything is hunky-dory.
It has been a sad week at TankTales HQ. Five fish from one
tank succumbed to a slight increase in ammonia – at least I think that’s what
it was. The PH was all over the shop as well, but the ammonia increase is the
most likely culprit.
The tank most recently housed a breeding pair of angelfish,
two bloodfin tetras, two golden widows, and a red rainbow fish from Papua New
Guinea. Now, just the two angelfish remain.
Koi angelfish and bloodfin tetra |
On Thursday I noticed the bloodfin tetras were missing. I
assumed that after a month of seemingly getting along well, the angelfish had
preyed on the tetras. The most likely scenario was that the angelfish had
resumed their breeding activity and had become aggressive to protect their
eggs. I couldn’t see any eggs or fry, but knew from past experience with this
pair that they were good at hiding their offspring and were very protective of
them; right up until the moment that they ate them, as they had done at least
six times in the previous six months. I went to work, feeling sad about losing
the tetras and feeling guilty about failing to protect them.
Black ghost angelfish and two golden widows. |
On Friday night, I couldn’t find the red rainbow fish, but the
other fish looked okay. I tested the water for ammonia and to my eye the colour
changed to bright yellow. I figured I had an aggression problem on my hands,
and thought about which of my other tanks I could transfer the widows to, so
they would be out of harm’s way. I couldn’t really transfer them to any of the
other community tanks without putting them at risk from the current
inhabitants, so I decided I would return them to Rayonne Aquarium in the
morning and ask that they be re-homed.
Rainbow fish, golden widow and the tail of the black ghost angelfish |
On Saturday morning the rainbow fish appeared again, but
I could only find one widow and it was swimming vertically. That’s not a
good sign. I located my floating fry cage and gently lowered it into the
“miracle” tank in the kitchen – so named because every sick fish I have put in
there has recovered. It currently houses ten mollies, five platys, six bettas,
two clown loaches and a bristlenose pleco – they are all well, healthy and
getting along, and the water readings are always perfect.
I scooped the widow out of the water and transferred it to
the fry cage, where it lay on its side with twitching fins. It didn’t last very
long. For the first time the “miracle” tank did not live up to its name.
Back at the anglefish tank, I grabbed a bucket and the
vacuum water siphon and got the water change started with a big suck on the end
of the siphon pipe. As the bucket filled and nasty goop was sucked out of the
gravel I moved the rocks, driftwood and other accessories. Under an aquarium tunnel that looked like a
hollowed out tree trunk that had been cut in half lengthwise, I found the
second golden widow, already dead. Poor thing. I scooped it out and added it to
the compost bin – the eventual final resting place for all of my fish.
I did a 40% water change while vacuuming all of the gravel
and with a net I fished out large particles of rotting leaves and stems from
the aquarium plant cuttings I keep in most of my tanks. The angelfish like the
bamboo leaves for spawning and the other fish welcomed the hiding places
provided by strings of baby’s tears and ludwigia. I change the plants every one
to two weeks and I take out the stems that are left once the fish have fed on
the plant leaves. Despite that regular clean up, there was still a lot of leaf
and stem litter covering the gravel.
A test of the water gave me a pale yellow ammonia reading,
so I did another, smaller water change (about 20%) and hoped for the best. Two
hours later the red rainbow fish, which had been swimming around quite happily,
was found dead on the gravel bed.
I tested the water again this morning and got the same pale
yellow reading so I did another 30% water change, a few hours ago. This time,
the ammonia test result is bright yellow and I am less fearful about losing my beautiful angels. The PH is back within the preferred range too.
All of the other tanks have been tested too. There's no ammonia
present, but some of the PH readings are not good so I’m doing lots of water
changes today.
I’m keeping my fingers crossed that the angels make it. If
they’re still alive tomorrow I will give them a small amount of food (they
haven’t been fed since Thursday) and keep hoping for the best.
Wish me luck.
#tanktales
*This is my personal
opinion and is not professional advice.