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L155 Adonis Pleco Species

L200 pleco

Ka Ying Yang Gotta: love the way that L155 looks!

Sunni Collins: Thank you!

Ka Ying Yang: Can’t believe how long that tail is.

Sunni Collins: I know! I keep wondering if it’s gonna stop growing… Tail is longer than the fish itself, lol luckily I don’t have cichlids or any fin nipping fish

Ka Ying Yang: Oh yes, that tail can be enticing for some to nip on! Do you have any other pleco species, Sunni?

Sunni Collins: 2 large commons 10.5″ & 8″, a 6″ sailfin, the adonis, L200, butterfly, sunshine, bn, and clown pleco…also a whiptail catfish, he’s cool hbout yourself Ka Ying Yang?

Ka Ying Yang: Those commons must produce a LOT of waste, huh? I remember my commons were so bad I had to give them away. My filtration couldn’t hold up. I’m currently raising: common bushynose plecos, 14, 18, 66, 91, 128, 134, 183, 190, 200, 201, 239 and 240. I’m sure I forgot one or maybe a few others! Haha.

Sunni Collins: Nice! That’s a lot!! This tank that I have, it has a 30 gallon sump, and it has grates on the bottom of the tank that suck up a lot of the waste pretty fast… Eventually I might have to get one of those 240 gallon bins for the garage, lol

Ka Ying Yang: Yes, keep upgrading. Luckily there’s always someone local who’s desperate to sell all his/her tanks and supplies!

Sunni Collins: Very true! I’m always looking for deals, just in case I stumble on something, haha

I need help. Please no negativity please.
I have a planted 75g coldwater community tank; and recently I have had a bunch of fish die. I have no idea why!

Parameters:
Ammonia: 0
Nitrite: 0
Nitrate: currently 0 (water change yesterday, tank is planted which absorbs nitrates, the nitrates rise very slowly because of this. I have done two test kits with two different tanks so to confirm the test kits actually work which they do. So I don’t think nitrate is the issue)
PH: 7.8
Temp: 21c
Lots of air bubbles: bubble wall and 2 air stones
Running an AC 110 filter

Inhabitants:
4 baby shubunkins
2 baby koi (used to be 3, one has died 🙁 )
1 baby fantail
1 dwarf pleco
1 weather loach
A school of danios. (Down to 3 from 20)
Previously 3 whiteclouds (they have died).

I realize this is an odd, perhaps inadvisable mixture but I monitor my fish carefully for stress or aggression and have a backup tank if necessary. Nobody is aggressive to each other.
I also know my tank is quite overstocked. But my nitrate levels are exceptionally good and they still have lots of swimming room. When they get too big I will put them in a pond. I use good brand foods too. Omega One brands.

All fish were quarantined and treated with prazi before being put in the community tank.

The story:

I fishless cycled my tank for 2 months. Once cycle was complete I added my shubunkins. Everything was great! Fish swimming around happily. Decided to purchase the fantail and dwarf pleco. Everything good still. Happy fishies. I buy some live plants: jungle val. Washed plants well before putting in. Still good. Parameters good. Everything is well. Get more plants: hygro Thai and ludwigia repens. Rinsed these plants as well. Add the 3 baby koi, weather loach and school of danios after quarantining. Koi show signs of stress but I assumed it was just a new tank causing it. They were acclimated by floating in the tank in bag beforehand And slowly adding water. Other fish are swimming around fine. 3 days goes by. Koi have refused food since arriving. One koi has died, as well as the 3 whiteclouds. Shubunkins and other koi are showing stress by either bottom sitting or just sitting at the surface with nose at the water line. Nitrates are still good but I perform water change anyways just in case. Treat tank with prime as always when adding new water. Getting worried.
Another 3 days and 90% of the Danios are dead. Now the shubunkins won’t eat. I am on red alert now. Something is really wrong!!
My routine is 50% water change once a week. I don’t clean or change filter media. I do vacuum the sand substrate I have. Feed in morning pellets, and evening daphnia along with food for loach and pleco after lights off. Lights are on 6 hours a day for plants. Lightly fertilizing with Excel. Nitrates are still low even with all the fish. Water is crystal clear. Fish were happy up until the newest additions despite parameters being good.

What is going on???? I am truly stumped.
I have tested everything I can possibly test for.