Sick guppy and weired behavior

[Savethemall]

Hi, i have a 70L tank with 10 guppies and 1 pleco, external filter 600 l/h water temp 26C water parameters are 0,0,7. WC every week 25%. 18 days ago one of the guppies became bloated. i moved him to quarantee and try to treat with Furanol with no success.His bloating was uneven, one side more bloated then the other,and ive assumed it was a tumor.He passed after 3 days since the first signs of bloat. Since then ive monitored the tank very carefully for any signs , but non appeared. Today iv found one of the guppies dead and another one laying on the bottom with raised scales{the other 2 didnt showed this sign.} last night they were all active, all came to eat with no signs of illness..Now one of he gupp started this weired behavior of swimming near the bottom in a weiired way ill add a video. Im worried that he is coming with an illness too. do you know what is this behavior?
I would appreaciate any help and advice about what is it and what to do to treat and prevent more infections. thank you

 

[Coryloach]

Hi, I first wanted to mention that you need to significantly increase your water changes long term. As an example, if you tank has a nitrate concentration of 20ppm, providing the fish do not produce anymore of it at all(impossible), you'd need 10 water changes at 25% in order to reduce the nitrates to zero, that's 2.5 months...So a 25% weekly water change is a guarantee of deteriorating water conditions.

Deteriorating water conditions are a guarantee for disease outbreaks.

On the symptoms, it is more likely internal worms or parasites, rather than bacterial. Bacterial issues are mostly secondary to worms and parasites.

As for the video, I can't quite see what do you mean. For a few seconds the fish looks like shimming but being a guppy, and only seeing the tail, I maybe wrong.

I'd up the water changes for a few weeks, try 50-70% at least per week at once. That'll be more effective keeping the water quality.

 

[kno4te]

Looks like a stressed fish. Can’t tell from the video. I’d assume water issues. Would do large water as already mentioned at least twice a week. That’ll help.

 

[Savethemall]

I dont understand wh do you think the water parametrs are a prblem. theres almost no nitrate increase im doing tests very often. The wc routine is enough to keep the nitrates down..

 

[kno4te]

I dont understand wh do you think the water parametrs are a prblem. theres almost no nitrate increase im doing tests very often. The wc routine is enough to keep the nitrates down..

Sorry didnt see the water numbers posted initially. Just looks stressed and water is usually a culprit.

 

[Savethemall]

Today one of the guppys{not the one that was acting weired} became bloated in the mornign and passed in the evening.. this bloat and other bloatswerne like dropsy, there were no pinconing and it seems like only a part of the belly is got bigger and not all of it... any advice please??

 

[kno4te]

Could add some Epsom salt 1 tbsp per 5g and kanamycin or something broad spectrum.