R
Red Tail Fan
RTF: How I envy your amount of space ...
TBTB: In all fairness, we are looking to do this professionally with a small DIY Public Aquarium.
RTF: Anyway, particularly down tonight as I have lost my arowana...
TBTB: My sincere sympathies. I know precisely how it feels. Yet this is part of the hobby and especially of the learning. Our hobby is much more complex than keeping a cat or a dog. You either learn to stomach setbacks and deaths or quit sooner or later. Hang in there, Val.
RTF: .... The redtail is fine,
TBTB: Does it feed? Has it fed after the aro loss?
RTF: so every night I was giving the redtail a small piece of prawn plus two of his pellets, the arrowana having his floating foodsticks...
TBTB: Sounds good.
RTF: ... but there had obviously been a lot of activity in the night ...
TBTB: The night is the activity time for the largely nocturnal RTC.
RTF: ... because there was pieces of prawn all over the tank floor so the redtail was obviously not eating all that I had offered and the amount had built up also making the water slightly cloudy.
TBTB: Do you mean over days? The uneaten feed must be taken out every day. Cloudy water can mean an uncycled tank due to bacterial bloom in the water column. Uncycled tank = ammonia in the water = stress for the fish = no appetite = eventual sickness or even death depending on the ammonia reading and the time period. Do you test your water for ammonia and nitrite with a liquid test tube test kit? I'd say this is one the most helpful things you could ever do to learn and avoid such things in the future as well as many other things too.
RTF: ... I quickly netted him out, he was very wriggly and I was hopeful, but I didn't have anywhere else to put him, I decided the best place was the tank with my bristlenost pleco and a white gourami, I felt that the bigger tank which has boisterous weather loaches in wasn't a good idea, as soon as I put him in there the gourami attacked him, and the arrowana hid behind the filter, I abandoned the net and just put my hand in to get hm out again, he was still very wriggly so again I was hopeful, the only other place was a polystyrene box where I am keeping from floating plants, I had also put in the tank a filter with water polishing floss in it as I don't have a UV steriliser Should I have one? would it have helped? I then changed most of the water and sucked up the pieces of uneaten prawn replaced the water and also added some Colony bacteria. Finally placed my arrowana back in the tank, he started swimming around and my hopes were raised, I had to go shopping and when I got back he was on the floor again and I then knew he wasn't going to make it despite all my efforts, I had even been praying for him.
TBTB: If I had to guess, I'd say the immediate cause of death was stress from all the handling, changing tanks, and the gouramy attack. Arowana, when small, are not hardy but a rather sensitive fish. A little too much stress and they cave. I'd still most definitely get the test kit and investigate the water where the RTC lives.
RTF: ... Another facet to this is my cat, she lays on the glass lid of the aquarium and taps/scratches at the glass with her paw I continually pull her off obviously but I cannot watch her all the time and I think this would have harrassed him.
TBTB: I think your hunch is right. Arowana is a ~100% surface fish, so it'd be swimming inches away from the cat and any sudden move or sound would spook it, piling up the stress again.
RTF: ... Well, in my efforts to make sure they were well fed I definitely overfed them, polluted the water?
TBTB: Nothing but an API liquid test could answer that with certainty.
RTF: ... Why is the RFT fine though?
TBTB: This is a good question. But you said the RTC hasn't been eating what you were offering. So it could not have been fine.
RTF: ... There is an ornament in the tank with tunnels and the RTF hides in there most of the time so he wouldn't have seen the cat?
TBTB: Surely if the RTC was affected by your cat, it'd be one millionth of that of arowana because it is a bottom and nocturnal creature.
RTF: Maybe if I had covered the tank? It's all maybe's,...
TBTB: Not all maybe's. Especially with the test results, I think the picture would have been more or less clear.
RTF: I don't know if I will replace him, I just know that I loved him and now I've lost him which sums up the story of my life.
TBTB: Val, take heart. This is the story of everyone's life... sooner or later. We are all in this together. I'll pray for you too.