I was on vacation for a week and asked a neighbour to feed the fish for me.
I returned to what you can see in the attached pic. The stuff that looks like sand in the foreground is a mass of rotting algae wafers. The water had a foul smell to it and there were bubbles coming up from the substrate underneath. The mini internal filter was so clogged up there was just the slightest trickle turning over, and this was with just coarse sponge - I had the foresight to remove the fine filter pad I usually use as the final filtration stage, otherwise I am sure the filter would have clogged completely.
Amazingly, my ammonia, nitrite, nitrate levels were all zero and the tank inhabitants seemed okay. I think the fact that the tank is pretty heavily planted has saved the situation. I've done a big water change with a thorough gravel vac and put some Polyfilter in the filter, will do more big water changes and gravel vacs over coming days.
My neighbour has looked after the tank previously and it was fine last time, so god knows what he was thinking putting so many algae wafers in there.
I suppose it's one of the hazards of the hobby where we need to find someone to look after things if we are not there. Will ask someone else next time.
I returned to what you can see in the attached pic. The stuff that looks like sand in the foreground is a mass of rotting algae wafers. The water had a foul smell to it and there were bubbles coming up from the substrate underneath. The mini internal filter was so clogged up there was just the slightest trickle turning over, and this was with just coarse sponge - I had the foresight to remove the fine filter pad I usually use as the final filtration stage, otherwise I am sure the filter would have clogged completely.
Amazingly, my ammonia, nitrite, nitrate levels were all zero and the tank inhabitants seemed okay. I think the fact that the tank is pretty heavily planted has saved the situation. I've done a big water change with a thorough gravel vac and put some Polyfilter in the filter, will do more big water changes and gravel vacs over coming days.
My neighbour has looked after the tank previously and it was fine last time, so god knows what he was thinking putting so many algae wafers in there.
I suppose it's one of the hazards of the hobby where we need to find someone to look after things if we are not there. Will ask someone else next time.