did a KH GH test today and completely lost with the results. 8 KH drops and 16 GH drops. the instructions completely bafling on how to convert that to a reading. any help with that?
Usually its easy: One drop is one german degree (which is the scale we use in the aquarium hobby all the time) so you've probably got KH=8 and GH=16, which means you haven't got any soft water problems. You have a nice high pH=7.8 and your water hardness will buffer this nice pH and keep it up there even when the cycling process adds acids to the water and tries to drive the pH down, which can result in the bacteria not being able to reproduce. Double check your instructions, but I think you should find the "one drop per" to be the case.
Well, the important thing is that you're probably still in a fish-in cycling situation, regardless of what's causing it. So the important thing is to always take action when this is the case. Begin testing twice a day, preferably at a morning and evening time that allows you to be pretty much 12 hours apart, usually a convenient morning and evening time when you'll likely be home. Test ammonia, nitrite(NO2) and pH and log them for yourself.
The goal is to be a detective and figure out a percentage and frequency of water changes such that when you next come back and test 12 hours later, you find that neither ammonia nor nitrite(NO2) has managed to rise above 0.25ppm. If it has then you need to increase the percentage or frequency of your water changes, if its staying closer to zero then you might be able to ease downward on changes, you just have to be the judge.
Anyway, just wanted to get you started on that and next up, once you've got that under control, the members will probably be able to keep interacting to figure out perhaps why this is happening to you so far from when the tank was started.
Not sure there about cooldude's comment. Even if you were showing double-zeros on ammonia and nitrite, your tank would benefit from very thorough gravel cleans each weekend, with whatever percentage of water comes out to accomplish that, up to 60% or so. Unless there is some problem with tap water I'm forgetting, large ones for maintenance should be fine. Although beneficial bacteria does form on all tank surfaces, including gravel, it is an insignificant contribution compared to the filter, because only in the filter is fresh oxygenated water with some ammonia flowing past all the bacteria on a regular basis. Getting organic debris out of the tank prior to it being converted to ammonia will lower the overall ammonia/nitrite load the struggling filter is trying to handle.
~~waterdrop~~