I am building a small goldie watergarden around 1200 gallons. I know it isn't ideal but because of space issues I would like to try and run a bottom drain to my skimmer instead of a settlement tank. I have an Oase biosys skimmer. Would if be better to run the line into the side or the front? There isn't a lot of room underneath the rigid basket. Will it just gravity feed or can I use a submersible pump in the back? Thanks!