Thank you everyone for your kind comments
Had a bit of a setback this morning. Under what reasons would ones tank turn milky white????
Tank was looking a little hazy last night, and slime coat was looking thickened on the clown loach-grains of sand were sticking to it. Everyone looked relaxed and not stressed in any way. Decided to do a water change the following morning as it was getting late.
I got down stairs this morning and this was waiting....
Two days ago...
I mean what the heck??
Breathing very very laboured, rainbows were being blown about unable to keep their balance. Straight away I took a glass of water for testing and set to work on a 50% water change whcih has now just been completed. During the water change, rainbows were as stated above, clown loach gulping like crazy at the water surface, to the stage I could move them about.... not normal.
Now (approx 15mins after change was completed), fish are a lot more active, rainbows have retained their balance and loaches foraging along bottom. The alpha is looking a very small bit faded, but not so much that its very noticable. Water has not cleared up in the slightest. Left the water level slightly lower than normal to allow max airation, the internals usually slim the top enough but just to be on the safe side.
Readings as follows
Ammonia 0
Nitrite 0
Nitrate 20
pH 6.4-6.6 A little lower than usual, usually up round 6.8-7.2
Tank has been setup for quite a while now, and was moved to the new house approx a month ago-no problems after it was set back up again.
I know bacterial blooms can cause this, but... I didn't realise it would affect the fish, especially is theres no ammonia/nitrite spike? Thought algal had a greenish look to it, and again harmless.... and this isn't green.
About 4days ago after 'hmming' for a few days, interpet was added to treat a 'tiny' bit of fungus that appeared on one of the loaches, It hadn't cleared up and for the sake of all fish in the tank, decided to treat everyone. No one was fed during this time. The tank is heavily stocked, but 30% water changes 5times a week keeps everything ticking over, the treatment stated a 7day duration, and a water change at the end so I have carried out no water changes a part from the 40% before the treatment.
Fish appeared fine, but did not do the usual begging that they do whilst you walk past, they did not seem stressed hence continuing on with the treatment. Fungus has not yet cleared up, but not spread..... Interpet states that it is harmless to filters, and this is clear in the test readings, no??
Will be doing another water change this evening, again of 50% unless water is cleared up a good bit and fish are relaxed and not stressed.
What else can I do a part from the water changes, that I hope remove most of the treatment. I can't actually see any reason that is causing this
Pic just taken now;
Ashleigh
, wild caught Melanotaenia boesemani (big tanks to Neil, yet again, very very nice fish 
