Hi, I am sort of new to fish keeping. Had tanks many years ago but only had our two for about 18months. The smaller one was infested with snails and weeds, decided to start from scratch so emptied it out and disinfected everything. Now looking good but then discovered both heaters had gone wrong so had to do the same with the 170 litre tank. Both now up and running and so far looking good. We bought our new selection from Pets at Home and were very impressed with the service and help.