being newbie, struggling where to post, but......my favorites are sharks, gouramis and tetras. Have 2 20s and can't decide how to or if I can combine these fish somehow. Seems both sharks & gouramis fight same species. Already have a 6in Bala shark which has been moved up from 5g to current 20g (poor guy could only swim-in-place). And want to thank u all about cycling hints, not sure how my first tank got started, but thereafter it was moving established water to bigger tank. This year is first time in 30ys i have encountered need to Cycle and have chlorine city water both. another question : first time with live plants. Been blaming plants on ammonia spikes and on loss of fish, then i read in a thread that live plants help control ammonia? i am confused...i tossed the plants out the other day, should i have kept them?