This doesn't help with your current problem- but may for later on once everything is settled. I have a 35l biube and a 30l biorb as well as a 125l tank.
As I keep only one fish in the tank (a betta) I choose to do a 25% clean each week- syphoning the stones and in the 'hole' left by removing the filter device (the bit that looks like a loo brush!). I use Tetra Aqua Safe to condition the water, and Cycle to keep the beneficial bacteria levels correct. I rinse the filter sponge in the waster water- and tend to replace the sponge every 5-6 weeks. I don't use the service kits anymore- as they were expensive and wasteful. I've bought a pack of filter sponges, and a tub of charcoal and this comprises my 'kit'. This system works very well for me. I don't trust anything that says that you only have to clean the tank out every 4-6 weeks. I don't see how the ammonia and nitrite levels can stay at 0 for this length of time. Maybe someone else knows!
When it comes to medication- I use eSHa and Melafix and Pimafix and measure appropriately. Again - I don't see how a Biube first aid kit will do the trick for everything. Again, maybe others have different experiences.
Hope this is of some help. Good luck