well bad news, after posting something positive too........
Checked him last night when I turned his light off, 9pm, all great. Came back into room at 10pm and noticed he was sitting on bottom, very unusual for him, no clamped fins tho.....turned light on to check him and all the new growth on his tail was gone ! It was raggy and his colour was pale, he looked shocked. I immediately checked water, nothing there to cause stress, levels very low, way under 0.25, but did a 50% water change anyway, adding salt to help his tail. After staying with him and playing a while his colour was normal and he was back to his old self, just with a blown tail.
The only thing that changed yesterday was his filter.......it is an aquaflow 100 internal filter, he does go under the uptake but his fins never get sucked in, they just brush against it, plus there is a few inches of sponge before the impellor......however it has a spray bar and I had made a tube from acetate which i placed over the bar to stem the flow to a trickle at the edge of tank. Yesterday I removed it thinking it would be fine and pointed spray bar to back of tank. I am wondering if he got caught in the flow and panicked in the dark? His colour was pale and he did looked shocked and this damage happened in a hour , so it is the only thing I can think of.
Went to bed very depressed and didn't sleep thinking about him. Dreaded getting up this morning, but he is still here and the tail just looks shrivelled at the tips but no more loss. His colour is vibrant and he was begging for breakfast. So none the wiser as to what this could be. Surely not fin rot as it went in an hour and I would have thought his tail would have vanished overnight at that rate. Plus he is no longer shocked and wasn't within a few minutes of getting attention from me last night.
Anyway, will now do maybe 2 x 50% changes a day to keep the water ultra clean and keep with the salt to protect his tail as its now an open invitation to fin rot ! I knew I would curse him by posting about his progress lol Ah well, we battled it once will do it again, he's a fighter and so am I. Just wish I could get him right. I just feel I am having no luck with him, maybe Im just not ready for bettas. My wcmm are great all happy and healthy. He is happy but this tail issue is a struggle, i really thought we had done it and were over the worst, all that lovely regrowth gone in an instant.
EDITED TO ADD:
OMG!!! I just tested his water, its 8am, 10 hours after doing a 50% change with a previous reading of less than 0.25 nitrite and it is now at 5 !!!!!!!! it has never spiked this high. I don't get it, it looks like Im at the nitrite spike of a cycle BUT I have never had levels of ammonia other than traces, never even got to 0.25, so is it possible it just went straight to the nitrite spike!? It has been going around 16 day with a new filter.......anyway done an immediate 90% change, and will monitor every few hours and change as required. great if its cycling but confusing if its not.
Okay done the 90% wc and tested again at 12pm, was at .25 nitirite so did another 70% change, will tests again in a few hours.......kind of looks like im going through the nitrite spike, which is good, means im cycling, but not sure why I never see much ammonia, unless a single betta doesn't produce enough to show more than a trace...........on day 16 so I guess the nitrite makes sense in that way.......
my filter refused to work after wc, unplugged and plugged back in 6 times then it worked, will have to keep an eye on it, cleaned the impeller just in case.......
betta looking vibrant still, no more loss of tail, will keep adding salt per wc and see how he goes.......more wc coming later today me thinks. it is not the water causing the nitrites as the wcmm tank is fine, virtually no notrites. The snail tank spiked at 1 today but their ammonia has been running at 0.75 so would expect that, changing them lots too now.