Ok so I'll start with history and status.
Tank = 15 Litres / 4 US Gal
Age = 1 Yr
Ammonia = <.25
pH = 7.4
Nitrate = (currnetly 0) was 20 prior to change which led to the reason for this post
Fish = Small Fighter (approx. 3cm body length and 6mm diameter - excluding fins)
Heater = Yes, but not at the moment as it's summer in Australia so ambient temp in the water is 23 Degrees C
Filter = Yes, only small (no bio-media or carbon, just a little sponge) running 4 Hrs a day to churn the water up a bit. I used to run it 24 Hrs a day but I read that Beta's like still water and do not like currents which is why I only run it for a small amount of time a day.
Water changes = 20% every 2 week
Ok so all was very well until my tank was starting to get gummed up with brown algae around the tank walls so I decided to do a big change and give everything; including the gravel, a clean.
I removed everything from the tank and washed the gravel by scooping it up with one hand and then rubbing the gravel between my hands before washing it back in the water that came out of the tank.
After I finished washing the gravel I threw most of the water away but left some so it wasn't a 100% change.
I then replaced the gravel and put a lot of new fresh water (probably 80% new water); as I mentioned this was the 1st ever big changed I'd done, I'm very regimented and changing smaller amounts more often. However the water was a cloudy / milky white colour after the cleaning session.
Initially I thought it was dust from the white gravel I'd washed that was still in the water I left to put back into the tank (being as it seemed to somewhat to settle on the little plant and the decrative bus I have in the the tank) but it seems to be hanging around... so against my better jedgement I did another 20% change which seemed to help but not cure.
So, I'm worried now and taken the fish out and placed into a bowl with water from my large tropical tank that's beautifully clean and well maintained (did a change on that as well yesterday) and has good parameteres all round while I get some advice to fix the problem.
the fish did seem to be less 'chirpy' and a bit distressed which is why I took him out and placed him into some known very good water...
From here I was thinking of replacing all the water in my beta tank with water from my larger tropical tank so at least my beta has some excellent filtered water to get back into but I'm worried for all sorts of reason.. most of all infection or bacteria...
What advise can I get guys?
Additional - having now spent some time reading some other posts I'm wondering whether the volume of fresh water might be in line with this post? http://www.tropicalfishkeeping.com/b...-water-102706/