Please help I have a 19 litre fluval chI with 1 half moon betta Malcolm and 1 Anubias I've been set up since January and apart from a few teething problems all was well a couple of days ago after a usual water change I awoke the next day and the tank was so cloudy I couldn't see Malcolm. I did another water change and it seemed to clear a little. I have been doing partials every day to try and clear it and this morning it is just as bad as it was and now there is a like a chalky residue covering everything even Malcolm. He doesn't seem effected and I think likes stalking in the gloom but I'm worried it might eventually hurt him and he has been through a lot. I need help I'm at my wits end could it be a monstrous bacterial bloom as we are having a heat wave or could our local water company done something to the water please help.