Apology accepted. The lfs guy seemed flaky to begin with which is why I came here.
I'm prepared to accept a huge error of judgement on my part, I should have done my research first but you do expect the lfs to offer first class advice, it turns out their backsides should resemble that of my goldfish's mouths when selling.
I'm going to go the extra mile with these goldfish and treat them to a new large home, I've just got off the phone with an aunty who is going to donate some mature medium whilst taking in my 3 chipmunks for a couple of months (she's an old pro but family woes stopped me asking her for initial advice)so I can mature my tank properly. I know this sounds like daft talk but it's worth it watching my son trace them across the tank, engrossed.
With all that in mind, I may still use the small tank for some snails but I'm still worried about aeration, the filtered water doesn't seem to break the surface even though there are 8 streams of water, is the water level too high