Filter System

[Assaye]

Glad to hear your pH is up. Keep an eye on it so that you can keep it stable.

To get your ammonia down you might need to be doing large water changes every day. Test daily and change as much water as necessary to get the levels down to zero.

You also mentioned you have a gibiceps plec - these monsters will exceed 2 foot long as adults and poop like mad. He will not be helping you get your water under control and unless you have the money for a 6 foot tank in the relatively near future, he's going to need to be rehomed. BiOrbs are not the best place for bottom feeders anyway as they don't have much surface area on the bottom and they rely on large stones as a substrate.

If you got rid of the plec (your LFS might take him or you could try rehoming on here) then your ammonia will probably lower naturally.

Don't add anymore fish until your water is 100% and has been for a week or so.

 

[ellena]

The level can reach between 2-4 mg/L, it rarely exceeds that.
I have had the tank about 4 months, i had it a couple of weeks before adding my first fish.
I last added fish on Tuesday (4 Mollies) and before that 2 weeks ago (5 Danios & a Small Gibbicep pleco)
The filter i change about once every 8 weeks, i remove the old & add some media into the new filter. Aswell as doing a water change & several other maintence procedures.
I use a tube to take out and insert new water. I suck up waste from the bottom with the tube. I usually do 15% or more pending on the Ammonia levels.
The tank is 60L
Its a biorb filter that is specific for the tank and the only one i have come across that fits in the designated area.
My tanks PH is around 6.2-6.4
I feed my fish, fish flakes twice a day. I feed my pleco vege disks once at night.


James

Just to add a little to the good advice you've had so far.
The ammonia needs to stay below 0.25 mg/l (ppm) If it's 2, that would mean almost 90% water change to make it safe. Although large water changes stress fish, they are always preferable to high ammonia levels. You can reduce the stress by doing 2 50% changes, about an hour apart.
It's clear from what you've said that the reason for the high ammonia is that your filter isn't cycled. There aren't enough bacteria in it to handle the waste the fish are producing. It can take up to 8 weeks each time you add fish for the filter to adjust.
You should never change the filter media. I know the blurb from biorb will tell you to, but that's 'cos they're quids in every time you buy new media. The media is what you're cycling, so if you grow all those bacteria on it, then throw it in the bin, you're starting over from scratch every 8 weeks!
When you say you change the media every 8 weeks as well as doing water changes, does that mean you only water change every 8 weeks? While the levels are high it might need to be several times a day.
I agree with getting rid of the pleco-it's not helping now and will become far to large in the mid-long term