Hi Ellana,
Glad your fish deaths have stopped!!!
It seems to happen to most people when they are just starting out but with more experience you'll be fine I'm sure, overfeeding tends to be the biggest downfall of newbies. If I can be of any help please feel free to PM me for whatever reason, if i can help I will.
It can be quite daunting when starting out as there is a lot of technical info to absorb quite quickly (if your that way inclined) and if that ain't bad enough there is a lot of conflicting advise to sift through. Probably the biggest misnomer with planted tanks is that of phosphates and nutrients causing algae. A lot of the advise you will get from apparantly trusted sources including manufacturers and local fish stores (LFS) will have you believe that phosphate/nutrients cause algae. This simply isn't true and is a real bug bear to some on this website (quite rightly too) as Clive points out frequently in his eloquent and often humourous manner.
The thing is phosphates and nutrients will feed existing algae compounding an existing problem but won't cause algae in the first instance. Ammonia combined with lighting triggers the algae to bloom. Once you have algae the nutrients/phosphate will feed it just as it would any plant matter.
To be healthy plants need to feed and photosynthesize, which we normally supply via fertilizers often refered to as NPK which stands for nitrogen, phosphate and pottasium. Carbon and lighting supplying the demands of photosynthesis. If plants are unable to satify
ALL their needs for these elements they become unhealthy and decay which causes ammonia which will then trigger algae spores which are constantly present in the water to bloom. They need smaller ammounts of other things too which we supply in a mixture called 'trace elements'.
This is why people who keep tanks without plants like to keep their phosphate and nitrates/nutrients as low as possible hense they don't feed any algae that appears in their plantless tanks which would compound their problem. This often leads to confusing and conflicting advise being dished out freely, even those who should know better i.e. the manufacturers, are lacking in this area.
To be honest I'm only really repeating what others have taught me through this website in the last year or so when it comes to plants and their requirements. What I can say though is that they are right as born out with the results of my own planted tank. Better to learn this quickly before your led astray by some well meaning but misinformed LFS assistant trying to sell you phosphate remover as what happened to me which ended up causing me problems and £20 out of pocket for the lesson.
If you can grasp the above the rest will fall into place relativly easily.
Also read this its not the only way to do things but it works and is soooo easy.
viewtopic.php?f=34&t=1211
Regards Chris.