On Sunday 6 rummy nose tetra and 2 rainbow fish added, a few plants added
on Tuesday, rummy nose tetra dead, additional drift wood and air stone added (pre soaked prior to going in) on Wednesday rummy nose tetra dead, 20% water change, RO to soften on Thursday, today, glass catfish AND balloon ram AND golden ram dead!
What is wrong? There is no major aggression in the tank, all coexist ok. Temperature 29C, no traces of ammonia, nitrates, everything on the water strip seems fine! Feeding once a day, alternating between warms and flakes My heart is breaking!
Do you have actual numbers for ammonia, nitrite, nitrate, pH, gH and kH? What test strips are you using? When you say the filter is "changed regularly" are you changing the media? If so when did you last do that?
Most rams need higher temperatures than other so that could be a cause. Guppies are hard water fish and the other fish you have mentioned are from soft water, and hardwater fish in softwater don't get their minerals they need. Glass catfish need groups of 6 or more and need bigger tank than you are offering I believe. Stop adding fertilisers daily, which might be the main reason of fish deaths. Which fertiliser do you use?