Help anyone, camallanus treated now fish dieing all over the place

[budgie55]

Hi all

Sorry first post is a asking for help one.

I have a 125litre tank current water stats are PH 6.4 (a tad low than it has been),Ammonia 0.5-1.0 (used ammo lock to detoxify this yesterday), Nitrite 0 and Nitrates 40.
Temp is 25-26 degrees c.
Pump is a juwel bioflow 600 (600/l per hour)
Water usually changes every 2-3 weeks (25-30%)
Food is hikari sinking pellets and tropical flakes
No new ornaments etc recently.

I have a mixture of fish currently have 1 cory catfish (see pics / not well), 3 dwarf gourami, 8 guppies, 2 swordtails, 3 platy and 3 plecs (2 baby and 1 adult 3.5" long).

I had camallanus worms (discovered in the guppies) which i have treated with levasimole 7% (bird wormer as can't find it anywhere else). I treated with 10ml of the wormer and have done a 50% water change (after waiting 3 days) and vac'd tank. Strangeley the guppies are all doing well. To treat properly I ripped out all of the existing plants as they were riddled with hair algae and were stopping me getting to vac the gravel.

This being said I have lost 6 fish some of which we have had for some time (mixture of 1 baby plec today, 4 cory, 1 guppy and all our neons.

I have tried everything I can think of to stop them dieing but I am at a loss. I've attached some pics of the catfish I have left (which looks the worst) plus some pics of the tank and the dwarf gouramis left.

Can anyone offer any help / advice?

Many thanks

Allan

 

[Mumma.of.two]

Welcome to AA!
Don't be sorry for asking for help!
First thing you need to do is up your water changes. 25% every 2-3 weeks is no where near enough. Most practice 50% weekly water changes. The best way to reduce ammonia is with water changes. Ammonia lock will only temporarily detoxify it for 24-48 hours. Keep doing water changes until the ammonia and nitrIte are at 0 and the nitrAte is 20ppm or lower.
Your gouramis look to be bloated. Are they still eating? What are you feeding?
I have used lavamisole to treat camallanus before without any adverse reactions. If an infestation is quite bad when the worm leaves the fishes digestive tract it can cause irreversible damage sometimes leading to the death of the fish. At a guess this combined with the high ammonia is what killed your fish. To prevent further fatalities I'd suggest a vigorous water change routine to keep the water as clean as possible. The levamisole will need to be repeated at 2 weeks after the initial treatment because of the worms life cycle.