About 6 months ago me and my partner purchased a tank from her grandfather, quite a snip I thought at 50 pounds. For this price we got:
* one fluval 305 filter
* 2 heaters
* an abundance of fake plants, ornaments and a cave.
* one glass tank measuring 4 feet in length, 1 foot in depth, and 1.5 feet in height.
We have had the tank running now for about 5 months, with about 10 dannios, 3 pictus catfish and 3 clown loachs. The thing is we have fallen in love with them cute little loacheys and now we want some more. But I'm determined to do it all properly, so I'm hoping for some advice from some of you helpful people out there

Could someone advice me on what equipment I will need to purchase, iv heard rumours of power heads and more filters and such? Hopefully you can tell I'm very committed to designing the habitat just right for the little beauties. We have to move the tank this coming Saturday so I was thinking it's the ideal time to install new equipment and change the substrate. We were hoping to use a fine white sand, does that sound ok?
I'm sorry if this has all come out in a jumbled mess but hopefully you can read my ramblings and make sense of it all.
Many thanks
Joe